1. Dupont Chemical uses a polymer to enhance the appearance of certain RV panels. The initial cost of one process was $150,000 with annual costs of $50,000 and revenues of $48,000 in year 1, increasing by $1000 per year. A salvage value of $20,000 was realized when the process was discontinued after 5 years. What rate of return did the company make on the process? Solve by trial and error.