(a) Using a discount rate of 16 percent, determine the net present value of the investment proposal. (Round to the nearest whole number.) $ (b) Determine the proposal's internal rate of return. Round answer to the nearest whole percentage (for example, 0.34555=35%). % (c) What discount rate would produce a net present value of zero? Round answer to the nearest whole percentage (for example, 0.34555=35% ). %