cash flow questionnaire, business and finance homework help

Question :1What is the payback period for the following set of cash flows?Year  Cash Flow0  -$4,5001  1,3002  2,4003  1,1004  800Question 2For the cash flows below, suppose the firm uses the NPV decision rule. At a required return of 10%, should the firm accept this project?  What if the required return was 21%?Year  Cash Flow0  -$145,0001  71,0002  68,0003  52,000Question 3A firm evaluates all of its projects by applying the IRR rule.  If the required return is 13%, should the firm accept the following project?Year  Cash Flow0  -$145,0001  71,0002  68,0003  52,000