Calculate the payback period for a project that has the following cash flows? The required return is 12.0%. Year Cash Flow 0 $ (21,000) $ 6,000 1 $ 6,000 WN $ 6,000 4 $ 6,000 5 $ 6,000 6 $ 6,000 7 $ 6,000 O 3.17 years O 3.50 years 0 3.33 years 0 3.67 years None of these are correct