What is the present value of the following future amounts? a. $ 600 to be received 9 years from now discounted back to the present at 9 percent.

b. $ 400 to be received 7 years from now discounted back to the present at 9 percent.

c. $1,200 to be received 11 years from now discounted back to the present at 5 percent.

d. $1,250 to be received 4 years from now discounted back to the present at 19 percent.