How do I solve this? can i have the formula as well as the correct answer please. The practice examples are not helping. Thank you

Present value of an uneven stream of payments) You are given three investment alternatives to analyze. The cash flows from these three investments are as follows: Investment End of Year $ $ 2.000 3,000 4,000 (5,000) 5,000 $1,000 1.000 1,000 1,000 4.000 4.000 4,000 (4,000) (4,000) 14,000 That is the present value of each of these three investments if the appropriate discount rate is 12 percent? What is the present value of investment A at an annual discount rate of 12 percent? (Round to the nearest cent.)