Brixton Products is considering the purchase of a new $520,000 computer-based entry order system. The cost of the system will be depreciated on a straight-line basis over its five-year life. Brixton plans to sell the applicable computer gadgets at the end of five years for $40,000. During the five-year life of the project, Brixton will kept $160,000 each year in order-processing costs. What is the approximate internal rate of return for this project? Ignore income taxes.