Calculate a discounted rate into column "E" with the formula "=C2ratepercent." For example, enter "=C28.50*90%" to calculate a 10 percent discount from the standard rate of $8.50.

Calculating IRR in Excel The internal rate of return (IRR) is a way to find what discount rate would cause the net present value (NPV) of a project to be $0—in other words, to find the highest ...