An investment has an installed cost of $574,380. The cash flows over the four-year life of the investment are projected to be $216,700,$259,300,$214,600, and $167,410, respectively. If the discount rate is zero, what is the NPV? If the discount rate is infinite, what is the NPV? At what discount rate is the NPV just equal to zero? input area: 12. (Use cells A6 to B10 from the given information to complete this question. You must use the built-in Excel function to 13 answer this question.)