Solve on paper please

Question 4 (20 points) RKI Instruments manufactures a ventilation controller designed for monitoring and con- trolling carbon monoxide in parking garages, boiler rooms, tunnels, etc. The net cash flow associated with one plant for the first 3 years of operation is shown. Determine the maximum number of rate of return values that must satisfy the rate of return equation, and find all rate of return values between 0 and 100% Year Net Cash Flow, $ -25,000 +21,000 +13,000 -6,500