i need to know how to do this by hand not by excel.

5. Calculating IRR. A firm evaluates all of its projects by applying the IRR rule. If the required return is 18 percent, should the firm accept the following project? Year Cash Flow 0 1 2 3 - $90,000 35,000 43,000 40,000 Calculating NPV. For the cash flows in the previous problem, suppose the firm sses the NPV decision rule. At a required return of 9 percent, should the firm accept nis project? What if the required return was 23 percent