Chemical Engineering Plant Economics
An annuity is a series of equal payments occuring at equal time intervals, and this amount includes the sum of all payments plus interest, if allowed to accumulate at a definite rate of interest from the time of initial payment to the end of annuity term. Ordinary annuity is used in the calculation of the

Discrete compound interest
Manufacturing cost
Cash ratio
Depreciation by sinking fund method

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Chemical Engineering Plant Economics
Payback period

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

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