Chemical Engineering Plant Economics
Expenditure on research and development (R & D) is categorised as the __________ , while making an estimate of the total product cost for a chemical plant.

Fixed expenses
General expenses
Overhead cost
Direct production cost

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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

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

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