10. An investment annuity of $100,000 earning 4.5% compounded quarterly is to make payments at the end of every three months with a 10-year amortization. a. What is the size of the quarterly payment? b. Calculate the principal portion of the 20th payment. c. Calculate the interest portion of the 33rd payment. d. Calculate how much the principal will be reduced in the second year. e. Calculate the total interest paid in the seventh year.