4.42 Ann White is planning to take early retirement. She has decided that she needs $15000 a year for the first 5 years of retirement: after that, Social Security and other pension plans will provide her with adequate retirement income. How much money will she need to have in the bank at the start of the 5-year period, if the bank pays (a) 10% per year. (b) 6.75% per year, compounded monthly? Compare the result in (a) with Problem 2.31(a). Ans. (a)$56 184; (b) 561 565