Valprado Industries is thinking of purchasing a machine that will produce plastic kitchenware. The machine would be used for five years, would cost $35,000, would have a $5,000 residual value, and would increase annual net cash inflows by $8, 800. Valprado uses the straight-line method of depreciation. Use the above facts and the present value factors below. a. Calculate the payback period (if necessary, round off and carry to one decimal place). years b. Calculate the accounting rate of return (if necessary, round off and carry to one decimal place). % c. Calculate the machine's net present value (use parentheses to indicate a negative net present value) based on a 12 percent minimum desired rate of return (if necessary, round to the nearest dollar). $