Barron Chemical uses a thermoplastic polymer to enhance the appearance of certain RV panels. The initial cost of one process was $126,000 with annual costs of $48,000. Revenues are $80,000 in year 1 , increasing by $1000 per year. A salvage value of $20,000 was realized when the process was discontinued after 8 years. What rate of return did the company make on the process? The rate of return made by the company is %