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A specialized automatic machine costs $280,000 and is expected to save $104,378.53 per year while in operation. Using a 9% in

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Answer #1

Let discounted payback period be n yrs

104378.53 * (P/A, 9%,n) = 280000

(P/A, 9%,n) = 280000 / 104378.53 = 2.682544

((1 + 0.09)^n-1)/(0.09 * (1 + 0.09)^n) = 2.682544

((1.09)^n-1)/(0.09 * (1.09)^n) = 2.682544

(1.09)^n - 1 = 2.682544 * (0.09 * (1.09)^n)

(1.09)^n - 1 = 0.24142896 * (1.09)^n)

(1.09)^n = 1 / ( 1 - 0.24142896) = 1.318268

using log both sides

n = log 1.318268 / log 1.09

n = 3.21 yrs

Discounted payback period = 4 yrs (nxt year, as payback would not be achieved in 3 yrs)

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