Chemical Engineering Plant Economics
'P' is the investment made on an equipment, 'S' is its salvage value and 'n is the life of the equipment in years. The depreciation for rath year by the sum-of years digit method will be

M/n x (P - S)
(P - S)/n
1 - (P/S)1/m
2(n - m + 1)/n(n + 1) x (P - S)

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Chemical Engineering Plant Economics
Payback period

Is the length of time over which the earnings on a project equals the investment
All of these
Is affected by the variation in earnings after the recovery of the investment
And economic life of a project are the same

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