11. Jeff's bank also offers a 36-month Certificate of Deposit (CD) with an APR of 2.25%. (a) If P=2000 what is A(8)? (b) Solve the equation A(t) = 4000 for t. (c) What principal P should be invested so that the account balance is $2000 in three years? (d) The Annual Percentage Yield is the simple interest rate that returns the same amount of interest after one year as the compound interest does. With the help of your classmates, compute the APY for this investment.