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A Machine that requires an initial outlay of $ 70000 is expected to yield comings afer tax but before depreciation (CFAT) of $6000, 512000, 517000, $20000, 520000and $25000 in years 1 to 8 respectively Calculate the payback period DA 6 years 7 months B. 3 years 4 months 7years 8 months D. 4 years 9 months