Zaire Electronics can make either of two investments at time 0 . Assuming a required rate of return of 14 percent, determine for each project (a) the payback period, (b) the net present value, (c) the profitability index, and (d) the internal rate of return. Assume under MACRS the asset falls in the five-year property class and that the corporate tax rate is 34 percent. The initial investments required and yearly savings before depreciation and taxes are shown below