Calculation of the present value of money.

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Chapter 27, Problem 3CQQ

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Calculation of the present value of money.

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machine A operated manually cost 2000naira has a life of 2 years, while an automatic machine B cost 5000naira but has a life of 4 years,operating cost for machine A is 4000naira per year while of machine B is 3000naira only, which should be purchased?consider 10% interest I need expert handwritten solutions