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If the cost of an equipment of the desired capacity is not available it may be estimated from the cost of another equipment using the formula

[A].	(cost)1 = (cost)2 [(capacity)2/(capacity)1]	[B].	(cost)1 = (cost)2 [(capacity)1/(capacity)2]
[C].	(cost)1 = (cost)2 [(capacity)1/(capacity)2]0.6	[D].	(cost)1 = (cost)2 [(capacity)2/(capacity)1]0.6

Answer: Option C