Chemical Engineering Plant Economics
According to six-tenths-factor rule, if the cost of a given unit at one capacity is known, then the cost of similar unit with '' times the capacity of the first unit is approximately equal to __________ times the cost of the initial unit.

N0.4
N
N0.6
√n

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Chemical Engineering Plant Economics
Payback period

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

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