For the following set of cash flows, Year 1 2 3 Cash Flow -$6,100 4,500 6,800 4,900 a. What is the NPV at a discount rate of O percent? b. What is the NPV at a discount rate of 12 percent? $6,826.50 $7,031.29 $7,167.82 $6,485.17 c. What is the NPV at a discount rate of 22 percent