The pieces of equipment required to place 160 cubic yards of concrete in 1 day by experienced workmen are two gasoline engine vibrators and one concrete pump. If the vibrators cost $76 per day and the concrete pump costs $580 per day, the variable cost of the equipment per cubic yard of concrete is closest to: (choose one)
(a) $0.95
(b) $3.63
(c) $4.10
(d ) $4.60
Cost/yd³ = [2(76) + 580]/160 = $4.58
Answer is (d) $4.60
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