Q: Last month, you borrowed $100 from your friend. If you promise to pay her today, how much will you give to your friend if both of you agreed to return the money with a 10% increase?
A: The increase is $100 x 10 / 100 = $10. So you have to give $100 + $10 = $110 to your friend today. The answer is 110.

Q: Kohen has a business selling apples. Once a week, he orders 10 boxes of apples to add to his stock. If each box has 300 apples and he sells 3/4 of his stock in a certain week, what total number of apples is not sold?
A: In a week, he orders 10 * 300 = 3000 apples. When 3 / 4 of the stock is sold, the total amount of apples sold becomes 3 / 4 * 3000 = 2250 apples. The amount of apples remaining is 3000 - 2250 = 750 apples. The answer is 750.

Q: Abigail built 10 fences. Each fence took her 30 minutes to build. If she builds fences for the next 8 hours, how many fences would she have built in total?
A:
8 * 60 = 480 minutes are in the next 8 hours. Abigail builds 480 / 30 = 16 fences. Abigail will have built 10 + 16 = 26 fences in total. The answer is 26.