The Imperial Chemical Company is considering purchasing a chemical analysis machine worth $13,000. Although the purchase of this machine will not produce any increase in sales revenues, it will result in a reduction of labor costs. In order to operate the machine properly, it must be calibrated each year. The machine has an expected life of six years. after which it will have no salvage value. The following table summarizes the annual savings in labor cost and the annual maintenance cost in calibration over six years. Find the rate of return for this project.

Year (n) Cost ($) 13000 2,300 2,300 2,300 2,300 2,300 2,300 Savings (S) 6,000 7,000 9,000 9,000 9,000 9,000