if selling of 10 pens is equal to,the coast price of 14 pens find the gain per cent
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Step-by-step explanation:
Let the CP of 1 pen be Rs x
Then,
CP of 14 pens will be 14×x=14x
And
CP of 14 pens=SP of 10 pens
Hence,
SP of 10 pens =14x
Then,
SP of 1 pen=14x÷10=1.4x
Gain=SP−CP.=1.4x−x=Rs0.4x
Gain(%)= gain/CP×100
=0.4x/x × 100 = 40%
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