Answers

2014-11-22T19:22:26+05:30
One dozen= 12 pens 15 dozens= 12×15=180 then one dozen of pens= rs 60 each pen= 60÷12=rs 5 as he sell each pen at rs 6.50 and when he bought each pen cost was rs 5. so his profit happened at sell price-cost price =rs 6.50-5 =rs 1.50
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sorry profit means gain as u know.i forget to write.