For the given cash flows, suppose the firm uses the NPV decision rule. Year 0 Cash Flow 157,000 $ 59,000 80,000 64,000 a. At a required return of 7 percent, what is the NPV of the project? (Da intermediate calculations and round your answer to 2 decimal places, e. b. At a required return of 21 percent, what is the NPV of the project? (A negat should be indicated by a minus sign. Do not round intermediate calculat round your answer to 2 decimal places, e.g., 32.16.) a. NPV NPV