Find the present value of the following ordinary annuities.

a. $400 per year for 10 years at 14%.

b, $200 per year for 5 years at 7%.

c. $400 per year for 5 years at 0%.

Now rework parts a, b, and c assuming that payments are made at the beginning of each year; that us they are annuities due.

d. $400 per year for 10 years at 14%.

e. $200 per year for 5 years at 7%.

f. $400 per year for 5 years at 0%.