the cost price of 12 pens is equal to the selling price of 18 pens . find gain or loss per cent
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Step-by-step explanation:
CP Of 12 pens =SP of 18 pens=x(let)
CP of 1 pen =x÷12 SP of 1 pen =x÷18
As CP is greater than SP . There is less.So,
L%=L÷CP ×100
I.e. (CP - SP)÷CP ×100
((x÷12)-(x÷18)) ÷ (x÷12) ×100
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