A man sell a sofa for $3210 making a profit per cent if he had sold it for $3360?
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When sP = 3210
then let profit = x
so cP = sp-x= 3210-x
again when sp = 3360
then profit = sp-cp= 3360-(3210-x)=150+x
so profit % = [(150+x)/(3210-x)]*100 %
then let profit = x
so cP = sp-x= 3210-x
again when sp = 3360
then profit = sp-cp= 3360-(3210-x)=150+x
so profit % = [(150+x)/(3210-x)]*100 %
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