An investment has an installed cost of $524,800. The cash flows over the four-year life of the investment are projected to be $224,850,$241,450,$208,110, and $156,820. If the discount rate is zero, what is the NPV? (Omit \$ sign in your response.) NPV $ If the discount rate is infinite, what is the NPV? (Negative answer should be indicated by a minus sign. Omit $ sign in your response.) NPV $ At what discount rate is the NPV just equal to zero? (Round the final answer to 2 decimal places.) IRR %