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Question
The cost price of an article is `4/5` times of its selling price. Find the loss or the gain as a percent.
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Solution
Let S.P. = 1
C.P. = `4/5 xx 1`
= `4/5`
∴ Gain = S.P. − C.P.
= `1 - 4/5`
= `(5 - 4)/5`
= `1/5`
∴ Gain % = `"Gain"/"C.P." xx 100`
= `(1/5)/(4/5) xx 100`
= `1/5 xx 5/4 xx 100`
= 25%
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