A trader bought certain articles at 10 for #15.00 and sold them to #19.50 per dozen. Find the percentage gain or loss

A trader bought certain articles at 10 for #15.00 and sold them to #19.50 per dozen. Find the percentage gain or loss
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Unit price bought=1.5 (15/10) and unit price sold is 19.50/12=1.625. 1.625/1.5=1.0833. So the percentage gain is 100(1.0833-1)=8.33%.

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