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All techniques Rieger International is evaluating the feasibility of investing $108,000 in a piece of equipment that has a 5-year life. The firm has estimated the cash inflows associated with the proposal as shown in the following table: The firm has a cost of capital of 11%. a. Calculate the payback period for the proposed investment. b. Calculate the net present value (NPV) for the proposed investment. c. Calculate the probability index for the proposed investment. d. Calculate the internal rate of return (IRR) for the proposed investment. *** a. The payback period of the proposed investment is years. (Round to two decimal places.) b. The NPV of the proposed investment is $. (Round to the nearest cent.) c. The probability index of the proposed investment is (Round to two decimal places.) d. The IRR of the proposed investment is %. (Round to two decimal places.) Year (t) 12345 Cash inflows (CF) $30,000 $30,000 $40,000 $30,000 $35,000