( 4 points) A project requires the investment of an initial amount P at time 0 . Over its useful life, the project will provide a net uniform annual amount of income A at the end of each year. The project will incur a future expense F at the end of its useful life. The useful life of the project is 20 years, and the annual interest rate is 7%. a. Calculate the uniform annual amount A over 20 years that is equivalent to a future amount F of $15,000. For this part, assume P=$0. b. Repeat part (a) with P=$8,000 and F=$3,000