The reason that the internal rate of return (IRR) technique and the net present value (NPV) technique sometimes give different answers about which investment to undertakes is that: Othey make different assumptions about the rate at which cash flows earned by the investments are reinvested Othey make different assumptions about how to measure the cash flows earned by an investment Othe IRR does not account for the time value of money while the NPV does Othe IRR uses a different estimate of the original outlay for investments than does the NPV