Given the following attributes of an investment project with a five-year life and an after-tax discount rate of 10%, calculate the net present value (NPV) and the payback period of the project investment outlay, year 0, $8,480; after-tax cash inflows, year 1, $920; year 2, $1,060: year 3, S3,100: year 4. $3,400; and year 5, $4,800. (Use the built-in function of Excel to estimate the NPV of this project.) (Negative amounts should be entered with a minus sign. Round your answers to the nearest whole dollar amount.) Payback period Years After-taxCumulative Cash Flows Year Cash Flows C 2