at the start of every week, john goes to the bank and deposits $125.50 from his last paycheck in a savings account paying a nominal 5.2% annual interest, compounded weekly. at the end of every month, cathy deposits $499 in an account paying a nominal rate of 6% compounded monthly. at the end of every two weeks, robert deposits $224 in an account paying 6.2% interest with biweekly compounding. assuming they all continue saving for 20 years what is the balance of the highest account at the end of 20 years?