Buys 12 felt-tip pens. it costs her £4.32. how much would 20 pens have cost?
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Cost of 12 felt-pens = 4.32
Cost of 1 pen = 4.32 /12 =0.36
Therefore,
Cost of 20 pens = 0.36 * 20 = 7.2
Cost of 1 pen = 4.32 /12 =0.36
Therefore,
Cost of 20 pens = 0.36 * 20 = 7.2
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