Additional Comments: Mrs. Alay has a 12-year-old son who will go to college at 18 years old. She has to pay the $20,000 tuition fee for each year in college (4 year college). The interest rate is 10% compounded annually. a.) How much does she need to put in the bank each year (1 year from now until her son is 18 years old) to cover all the costs? b.) How much does she need to put in the bank each year (1 year from now until her son is 21 years old) to cover all the costs?