Question 14 The internal rate of return (IRR) is the discount rate that makes the NPV greater than zero the discount rate that makes the NPV equal to zero the discount rate that makes the NPV less than zero the discount rate that is equal to the NPV Question 17 One of the biggest flaws of the payback period method is it ignores the cash flows occurring afer the payback period it is easy to calculate it is a rough measure of liquidity it is commonly used in industry