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Mathematics for IGCSE & O level - Ratio And Proportion (Section 4 - No. 12)

If 5 pens cost $7.50, how much will 8 pens cost?
$10.00
$12.00
$14.50
$16.00

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Cost per pen = $7.50 / 5 = $1.50. 8 pens will cost 8 * $1.50 = $12.

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