Please show formula for part b. Do NOT use excel.

Hw 7 5. Given the net cash flows (right) for corresponding years, perform steps a-e: Year Net Cash Flow (SS] a) How many possible rate-of-return values are there for this cash flow? Address 0 5000 both Descartes' Rule and Norstrom's Criterion. 1 5000 W N 0 4 15000 5 -15000 b) Write a rate of-return equation and use it to compute the present worth of the cash flow at the following interest rates: 0%, 10%%, 20%%, 30%%, & 40%. ROR eq: 0% 10% 20% 30% 40% PW c) Plot the present worth vs the interest rates in b) above. dj Using the plot in c) above, approximate the rate of return value(s). el Use the ROR equation in b) to find the actual rate(s) of return for the cash flow