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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.

A. n

B. n0.6

C. n0.4

D. √n

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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