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
Overhead cost
Direct production cost
General expenses

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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
And economic life of a project are the same
Is affected by the variation in earnings after the recovery of the investment

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