Brief Exercise 12-9 Swift Oil Company is considering investing in a new oil well. It is expected that the oil well will increase annual revenues by $129,000 and will increase annual expenses by $85,000 including depreciation. The oil well will cost $446,000 and will have a $9,000 salvage value at the end of its 10-year useful life. Calculate the annual rate of return. (Round answer to 2 decimal places, e.g. 12.47.) Annual rate of return