please explain a, b and c

(Related to Checkpoint 6.6) (Present value of annuities and complex cash flows) You are given three investment alternatives to analyze. The cash flows from these three investments are as follows: Investment Alternatives End of Year B C A $10,000 1 $10,000 10,000 10,000 10,000 5 10,000 $ 10,000 6 10,000 50,000 7 10,000 8 10,000 9 10,000 10 10,000 10,000 (Click on the icon in order to copy its contents into a spreadsheet.) Assuming an annual discount rate of 21 percent, find the present value of each investment. a. What is the present value of investment A at an annual discount rate of 21 percent? $ (Round to the nearest cent.) 234