Please show your calculations

A company is considering the purchase of an industrial laser for $150,000. The device has a useful life of five years and a salvage (market) value of $30,000 at the end of those five years. Annual revenues are estimated to be $55,000 per year. Annual expenses are guaranteed to be $10,000 per year. Using a MARR = 18%, determine how sensitive the decision is to changes in the estimate of annual revenues? Express your answer as a percent change from the estimated value of $55,000. Write a sentence explaining the meaning of your answer.