DIY Construction Co is considering a new inventory system that will cost $750000. The system is expected to generate positive cash flows over the next four years in the amounts of $350000 in year one, $325000 in year two, $150000 in year three, and $180000 in year four. DYI's required rate of return is 8%. What is the internal rate of return of this project? a. 11.57 b. 13.68 c. 15.13 d. 10.87