i need help with section b, problem d. Thanks!

a. Determine the equal annual net cash flows from operating the bulldozer. Use a minus sign to indicate cash outflows. Briggs Excavation Company Equal Annual Net Cash Flows Cash inflows: Hours of operation v Revenue per hour Revenue peryear Cash outflows: Hours of operation V Euel cost per hour Labor cost per hour or Total fuel and inber conte per hour - v Eueland labor costs per year Maintenance conts per year - Annual net coth flows v b. Determine the net present value of the investment, assuming that the desired rate of return is 20%. Use the present value of an annuity of $1 table above. Round to the nearest dollar. If required, use the minus sign to indicate a negative net present value. c. Should Briggs Excavation invest in the bulldozer, based on this analysis? , because the bulldozer cost is the present value of the cash flows at the minimum desired rate of return of 20% d. Determine the number of operating hours such that the present value of cash flows equals the amount to be invested. Round interim calculations and final answer to the nearest whole number. x hours