(4-13). Present Value of an Annuity Find the present value of the following ordinary annuities (see the Notesto Problem 4-12). a. $400 per year for 10 years at 10% b. $200 per year for 5 years at 5% c. $400 per year for 5 years at 0% d. Now rework parts a, b, and c assuming that payments are made at the beginning of each year; that is, they are annuities due.