EatingGoodNow
Pro
I looked at it as if he created a debt of 10$ after his second purchase. His final sale was $90. Paying back his $10 debt leaves him with $80 dollars. $20 more than the $60 he began with. Even if you assume he has more money to put towards the $80 goat, he still makes $20 bucks.
I took up to calculus 3 and graduated with an engineering degree...
...I’ll be honest and just say that I don’t know the answer to this. :manny;
The fact that he had to come up with $10 to buy the goat the second time is throwing me off.