Net Present Value Method-Annuity a. Determine the equal annual net cash flows from operating the bulldozer. Use a minus sign to indicate cash outflows. 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 6%. 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. hours