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in Mathematics by (63.7k points)

A dealer sold three-fourth of his article at a gain of 20% and remaining at a cost price. Find the gain earned by him at the two transaction.

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Best answer

Let the C.P of the whole be Rs x 

C.P of 3/4th = Rs 3x/4,C.P of 1/4th =Rs x/4 

total S.P=Rs [(120%of 3x/4)+x/4]=Rs(9x/10+x/4)=Rs 23x/20 

gain=Rs(23x/20-x)=Rs 3x/20 

gain%=3x/20*1/x*100)%=15%

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