A retail credit card allows its users to make purchases and pay off the debts through month-end payments equally spread over four months. The interest rate is 28.8% compounded annually on such purchases. A customer just placed $1,000 on the card and intends to use this plan. a. What is the amount of the final payment? b. Calculate the total interest incurred by using the payment plan. Hint. Ans. a.263.47, b.53.85