Greetings. I need help with these three questions regarding finances.

1) A person received a loan worth $200,000.00 at 9% annual interest. How much will he have to pay at the end of year 4 after the loan ends?

2) How much money should a person invest today if he is assured of a guaranteed return of $40,000 per year for 10 years at an interest rate of 7% per year?

3) How much money will a man have in his retirement account after 20 years, if he deposited $50,000 annually at an interest rate of 6% per year starting today?