For the given cash flows, suppose the firm uses the NPV decision rule. Year 0 1 Cash Flow -$ 157,300 47,000 78,000 64,000 2 3 a. At a required return of 6 percent, what is the NPV of the project? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. At a required return of 15 percent, what is the NPV of the project? (A negative answser should be indicated by a minus sign. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) a. NPV b. NPV