Here are the cash flows for a project under consideration: -$6,870 C1 +$4,680 C2 +$18,120 a. Calculate the project's net present value for discount rates of 0, 50%, and 100%. (Round your answers to the nearest whole dollar.) Discount Rate Net Present Value 0% 50% 100% b. What is the IRR of the project? (Do not round intermediate calculations. Enter your answer as a whole percent.) IRR