How much will 40 copies cost if 18 copies cost 1.08?
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cost of 18 copies = 1.08
cost of 1 copy = 1.08/18 = 0.06
cost of 40 copies = 0.06 × 40 = 2.4
cost of 1 copy = 1.08/18 = 0.06
cost of 40 copies = 0.06 × 40 = 2.4
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correct answer is 2.4
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