pen are bought at 12 for a rupee for sold at 9 for a rupee. fine the gain percentag.
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Cp= 12 pen for 1 rupee
For 1 pen = 1/12 rupee
Sp=for 1 pen =1/9 rupee
Profit =((sp-cp)/cp)×100
=((1/9-1/12)/1/12)×100
=33.3333%
For 1 pen = 1/12 rupee
Sp=for 1 pen =1/9 rupee
Profit =((sp-cp)/cp)×100
=((1/9-1/12)/1/12)×100
=33.3333%
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