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The useful life of a certain piece of equipment is [#permalink]
18 Nov 2009, 20:47
This post was BOOKMARKED
68% (01:18) correct
32% (00:18) wrong based on 82 sessions
The useful life of a certain piece of equipment is determined by the following formula: u =(8d)/h^2, where u is the useful life of the equipment, in years, d is the density of the underlying material, in g/cm3, and h is the number of hours of daily usage of the equipment. If the density of the underlying material is doubled and the daily usage of the equipment is halved, what will be the percentage increase in the useful life of the equipment?