1. If you want to accumulate $ 2,750 by making a series of 5 annual payments, at 8% annual interest, what is the required amount of each payment?

2. An engineer wants to buy a house for $ 60,000 by making a down payment of $ 15,000 and borrowing the remaining $ 45,000, which he will pay monthly over 20 years. How much will the monthly payments be if the bank charges 9% interest per year?

3. Alberto requests a loan of $ 10,000 to be repaid in 8 years at the bank, at a compound interest rate of 12% per year, from a financial institution. How much money accumulates in that period?