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Question: An investment has an installed cost of $520,800. T...

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An investment has an installed cost of $520,800. The cash flows over the four-year life of the investment are projected to be $228,850, $245,450, $212,110, and $160,820. If the discount rate is zero, what is the NPV?

At what discount rate is the NPV just equal to zero? (Round your answer to 2 decimal places. (e.g., 32.16))

i need to know how to do calculation step by step for the second part. Ignore the first part.. This answer is actually posted on chegg study, but doesn't how the calculation is done. It seems like scary math.