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? Give me reasons, before answering the question
The increase is $100 x 10 / 100 = $10. So you have to give $100 + $10 = $110 to your friend today. So the final answer is 110.