Son Gohan liked to think that he was the smartest member of the Son Family. Growing up in a family reclusive to societal norms, the hybrid Saiyan had grown up with no friends aside from Icarus, a dragon he met almost a decade ago. His methods of companionship came only in the form of his father Son Goku, his mother Son Chi-Chi, and occasionally his grandfather the Ox-King.

It was a fine evening on Mount Paozu, where the crickets and occasional howling of wolves could be heard. Aside from that, things were relatively quiet; only the sound of a clock ticking and the twirling of his pencil broke the silence.

He looked out the window from his desk, where he did his homework. It was somewhat simple enough - limits and trigonometric functions. From what his mother said, what he was doing was not in the realm of a normal teenage kid. Not at all.

It had been an hour, and he was stuck on the last question. For his math homework, a short 10-question paper due tomorrow. The last question seemed to grate against his brain at every angle, every approach possible.

"As much as I love doing work, it gets annoying at times! What am I missing? ... Just look at dad, all calm and not a care in the world." Thought Gohan.

His father Goku sat by idly, looking around his room. Occasionally he would take short glances of his homework, then would quickly shift his gaze away from it and stare off again, whistling innocently. This was routine for Gohan; his father would take a quick glance at his work, then whistle off randomly. Other times he would do a couple of push ups, query him how he's doing with the homework so far, and random facts about his life that Gohan found far more entertaining than whatever he was doing.

"I wonder what he's thinking about? Must be how difficult it is. Because I have no idea how to approach it either! Okay Gohan - focus. Get back on track. You have to be on school tomorrow!"

Speaking of school, he had a great track record of being late all the time – something that Gohan needed to step up on. Crime-fighting while being a high school student wasn't exactly a reason to openly share with the teachers during three-way conferences, but he hated how they just couldn't seem to understand.

It was an unusual case. Gohan decided to focus back on his work, now driven by a desire to finish it and possibly let some steam out. "Last question, Gohan. You can do this! I bet dad wants to train, which is why he's here all the time while I'm doing work."

It looked really simple. A limit of 0 and a trigonometric function divided by x. What was x? Gohan's mind rolled over every possibility. Miraculously, Goku stood still and even paid attention to his work. He let out a contemplative hum, and went back to pacing back and forth in his room.

Truth to be told, he'd rather go training than do all this... Doohickey. Gohan thinks his father would do too, but since his mother and his younger brother Goten went to the mall with Bulma for dubious reasons he was now stuck in Gohan's room, awaiting orders.

"What could dad be thinking? There's no way he'd do this with me...Mom said he's not that smart..." Or so Gohan thought. His mind now cleared of any lingering thoughts, the room seemed to feel even quieter than before.

"1." It was all his father Goku said to break the silence.

"Huh? Dad?" Gohan, in disbelief, locked his eyes onto his father, who was still fixated on his work. "How did he do it? He can't be serious..."

"What? Dad, how... How did you know that?" Gohan questioned.

"You don't see it, Gohan?" Goku asked him, his tone now mirthful. The Saiyan took his pen and went to an empty space on his homework paper. "This should be great."

Gohan chuckled. Sure, he respected his father as a great warrior and a greater father, but a great academic teacher? Not so much. He remembered his father needing a pictogram to go shopping at the market for food! It was ludicrous for his dad to think of an answer to this limit problem.

His dad started writing the question again. "Here, put the zeros on x. What do you get?"

"Hmm... Sine of zero divided by zero?"

"Good! Now, look at this circle thingy." He points to the unit circle that was drawn quite well, courtesy to Gohan. "Sine is what, Gohan?"

"The y..."

"Right! So, if your sine is 0, then your answer is zero. Now, go back to the question - What is zero divided by zero?" Asked his father, as he scribbled the question yet again. He tries to reach for the nearby calculator, but his hand was surprisingly slapped off by his father.

"Damn, I shouldn't have done that!"

Goku's face went somewhat... dark given the lighting. This surprisingly worried Gohan; how much of a math nerd was he? "Now now Gohan, listen to me. You won't need 'em, I swear. If I were to split zero zero times, what would I get?"

"Uhh… I don't think that's an actual thing, dad." Gohan replied. He saw Goku's eyes light up, glimmering with pride.

Exactly, and this means we use this rule thingy I learned from Bulma! Goku smiled. "Something about a hospital, but I don't remember."

"The L'Hopital's Rule?" Gohan asked. "How does he know that? This is some serious Calculus stuff dad's just toying with!"

"Sure, whatever it was. I thought it was a hospital. Anyways! What do you do with that... Hospital?" Goku asks.

"Ooh, I know now! take the derivative!"

"Nice one! The rest is up to you, son!" said the Saiyan patriarch in a mirthful tone. Gohan happily continued with his work, the feeling of suspicion still lingering at the back of his mind as he worked diligently to finish it.

First of all, what the hell was that? "My father knows how to do Calculus? That can't be! There must be more to this than just my dad knowing how to solve a limit problem I was stuck on for over an hour! I've gotta ask mom if she knows anything about that... quietly. I mean, he did mention Bulma. I still can't believe it!"

Secondly, how his father explained it was just like how he approached teaching him training; abrupt, quick to the point, and preferring action first. That's how he learned Super Saiyan, after all. Now 16 and having unlocked powers far greater than that since the Cell Games, he still notices the training methods his father uses, both physically and mentally, just as Gohan had discovered.

As he wrapped up the problem, the answer was getting closer. "This can't be... It's 1!" Gohan thought, now at the cusp of finishing it.

"Now do you believe me?" he asked, chuckling as he scratched his head.

Gohan quickly stood up from his seat. "H-how did you know what to do, dad?" he asked in disbelief. "That's amazing; I always thought you were only into fighting and training."

"First of all, thats silly. And second of all, it's mental training, isn't it? Helps train your brain to look at every angle!" Replied his father. "Kami said it was, and I just went along with it! Feels like a metal puzzle, y'know."

"So does that mean... You could've helped me all the time you were here?!" He asked, now even more shocked at those times where he almost wanted to bang his head against the wall.

"Just as I said, it's training! I only helped because you've been stuck for the last hour or so."

"Huh... The more you know." Gohan replied, his head now in the clouds. "Does that mean..."

"You want me to help you from now on?"

Yes - I mean, no, not if you're training your dad, of course!

"Come on, do you know how many times I wanted to help you since you were a kid?" Goku asked, now looking around his room. "I didn't do it because you and your mom would be livid, and it meant you'd keep asking me for help all the time."

"Oh, I see..."

I wanted you to be self-sufficient, Gohan. I want you to be independent, yet know when to ask for help if you ever need it. Did you notice how I would drop random hints when you were, like, nine?

Gohan tried to recall those moments before. Moments where he was doing basic algebra, and...

"Wait a minute! So those pencils didn't happen to just form a 7 when they fell to the floor, you did those too dad?!" Asked Gohan.

"The one and only!"

"Huh... That's my childhood ruined I guess." Gohan muttered jokingly. "So what other things do you know dad? Just math?"

"Well let's see... If you bring me math, physics or chemistry to some extent, I may be able to help you, son!" Goku chuckled, reaching for his son's hair and giving it a light ruffle.

While his dad ruffled his hair, Gohan's mind drawled off. "My dad knows math, chemistry and physics? That's insane! I never knew he studied those! So all those times... I could've asked dad huh?" Thought Gohan, now dumbfounded.

"Well, since you're done your homework, whaddya say we go training? Let all that steam from your brain cool off?"

The word training pierced through Gohan's mind, now making him spike up excitedly. "Awesome! I've been wanting to ask just that dad! Let's do it!" Gohan cheered.

"I can get used to this version of dad," Gohan smiled, putting on his purple gi.

Another beautiful day had passed on the tranquil Mount Paozu. The Son household, as usual, rose with the sun at around 4 am. Chi-Chi, the housewife, woke up to a cold embrace as she noticed her husband was missing from the bed.

Most of the time, Goku would have slept in. Before the Cell Games, his tendency to sleep in was due to the exhaustion from rigorous training and working on the farm. However, recently, it has been shown that he is actually waking up earlier than his wife.

"Gohan? Goten?" She beckoned for her children from hers and her husband's room. No response. For Gohan's case, it made sense. He studied more than Goten obviously did, but Goten took roll calls seriously. "What is going on? I can't feel their ki at all!"

Peering out to the window, where the farm was completely visible, she watched her husband vigorously harvest the crops he had planted three months ago. Namely, cabbage and radishes. Some carrots too that for some reason Goku wouldn't share exactly why.

Still no sign of Gohan or Goten. Their ki signatures were... About a kilometre or two away from home. Probably training. "I'll let it go. Gohan's deserved some time for himself. That sweet Goten however... Did he even do work at all?"

Getting up from the bed, she began her morning routine and started making preparations for breakfast. Knowing that her Saiyan babies were always hungry and demanded absurd quantities of food, she whipped out the large wok and started cooking fried rice.

Just in time, Goku arrived on the scene, his hands dirty and covered in dirt. Who needs vehicle farming when you can get your training done manually anyway? With a cheerful expression, likely due to a productive day's work, he walked into the kitchen and caught the sweet scent of cooked rice. His favourite.

"Smells great, babe, what's for breakfast?" asked the Saiyan patriarch.

Ignoring the obvious question, she instead asked for something else. "Goku, can you bring me those carrots you harvested? I'll need them for this fried rice."

"And while you're at it, can you catch some fish for me too? Cut them up properly; I don't want Goten to get pricked by a bone again, do you understand me?"

"The fish? Sure! I'll ask Gohan and Goten about it. It's time for them to learn how to pick the right fish. As for the carrots, hmm... sure, how many do you need? I'll have to keep some aside for demand."

Now that was weird. Goku, talking about something in the lines of economics and not training or fighting? What a surprise. "Did I just hear you say 'demand', Goku?"

"Well yeah babe, you see... the farmers over at Satan City and East City just can't seem to grow enough carrots, and they've been relying on my crops for quite a while now. I've gotta keep up with the demand if we want the big zenis, right?"

Chi-Chi seemed dumbfounded by the explanation from her husband. Usually, not to sound like a broken record, all Goku ever talked about was fighting, training and eating. Now here he is, talking about supply, demand and zenis - as if he's practiced business and economics in his life!

"Goku, what exactly do you mean by supply and demand? You're not just pulling this out of your tail, right? Are you sick?" Chi-Chi inquired, putting a palm on his forehead.

"Woah, woah... calm down, Chi! I thought you'd know that by now!" Goku raised his hands defensively, flicking water around him. "Well, I usually sell carrots every three months. On average, I make 35,000 zeni every three months with it!" Goku exclaimed. "Pretty cool, right?"

"Y-yeah..." Stammered Chi-Chi. Quick maths? Very un-Goku of him. "He's gotta be sick with the flu."

"Since that comes from Satan City alone, I try to divvy up my carrots to other cities so that I can make even more money from selling them." Goku smiled, and walked over to the framed map of the world. "Let's say if I were to sell around 60 percent in Satan City and 40 percent in East City, and my price is 0.55 zeni per kilogram, that would jack my profit up to...let me see..." Goku twiddled with his fingers.

Chi-Chi couldn't believe it. Her husband was counting...how much money he makes? He wasn't the person to count at all before; what had happened to him that made him do all this just now? And 0.55 zeni per kilogram got him to 35,000 zeni in one city alone? What a price gouger!

"My Goku, my sweet Goku that wouldn't hurt a fly...now hurts people's pockets?! What is going on?!"

"40,000 zeni! Not much but it's something, right? And if I were to combine that with my bigger crops, let's see... It's 101,000 zeni! See why I need to think about the supply and demand, Chi?"

"Y-yeah, sure... Erm, back to the food..." Chi-Chi's train of thought was completely shattered. "It shouldn't hurt so much... Just five carrots?"

"Five? Well what are we waiting for, the next winter? I'll get 'em right now!" Goku rushed outside and flew to his patch.

Leaving a dumbfounded Chi-Chi, who instinctively pulled out a body thermometer, a wet rag, and an emesis bag. Placing them on the table, her plan was to definitely check up on Goku. It had to be a fever. A really bad one.

Hehe smart Goku :) Also I completely made up the prices - I'm a physics student not a businessman.