15. Most banks compound interest more than once a year. When interest is compounded n times per year for t years at an interest rate of r, the principal, P, grows to the amount A given by the formula: A = P(1 +3nt
a.) Brian received $250 for his high school graduation gift. He wants to invest it in a savings account compounded
monthly with a 7.3% interest rate for four years. What is the balance of his account after four years?