Gregg Snead has been offered four investment opportunities, all equally priced at $45,000. Because the opportunities differ in risk, Greggs required returns (i.e., applicable discount rates) are not the same for each opportunity. The cash flows and required returns for each opportunity are summarized below.

a. Find the present value of each of the four investment opportunities.

b. Which, if any, opportunities are acceptable?

c. Which opportunity should Gregg take?