Why are projects with negative net present values (NPVs) unacceptable to a firm? Select one: a. Returns with negative NPVs cause an equal profit ratio. b. Returns lower than the cost of capital result in higher profit ratios c. Returns lower than the cost of capital result in firm failure. d. Returns with negative NPVs are acceptable to a firm. Should Pan American buy the machine? Select one: a. Yes. NPV is positive and IRR exceeds cost of capital. b. No. IRR is higher than the cost of capital. c. Yes. NPV is positive and IRR is less than cost of capital. d. No. NPV does not provide enough information