Oriental Corporation has gathered the following data on a proposed investment project: Investment in depreciable equipment Annual net cash flows Life of the equipment Salvage value Discount rate $ 640,000 $ 86,000 20 years $ 0 9% The company uses straight-line depreciation on all equipment. Assume cash flows occur uniformly throughout a year except for the initial investment. The payback period for the investment would be: (Round your answer to 1 decimal place.)