27. What is the present value of the following cash flows, assuming an interest rate of 6%? a. $1,500 received a year from now. (2 pts.) b. $3,000 received three years from now. (2 pts.) C. $4,500 received five years from now. (2 pts.) 28. Answer the following questions relating to perpetuities. a. Define a perpetuity (2 pts.) b. Find the present value of a level perpetuity with a payment of $500 per year and a yearly interest rate of 6%. (3 pts.) C. Find the present value of a growth perpetuity with a payment of $300 per year, a growth rate of 3%, and an interest rate of 7%. (3 pts.)