For the given cash flows, suppose the firm uses the NPV decision rule, o. At a required retum of 12 percent, what is the NPV of the project? Note: Do not round intermediote calculations ond round your answer to 2 decimal ploces, e.g., 32.16. b. At a required return of 21 percent, what is the NPV of the project? Note: A negative answer should be indicated by a minus sign. Do not round intermediate colculations and round your answer to 2 decimal places, e.g., 32.16