pl help me to solve these questions. For the question 1, why we need to plus 5000 after we Get 33333.33?

A perpetuity of $5,000 per year beginning today is said to offer a 15 percent interest rate. What is its present value? A. $33,333.33 B. $37,681.16 C. $38,333.33 D. $65,217.39 What is the present value of a four-period annuity of $100 per year that begins two years from today if the discount rate is 9 percent ? A . $297. 21 B. $323. 86 $356.85 D. 8388 .97