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Question
Find the loss or gain as percent, if the C.P. of 10 articles, all of the same kind, is equal to S.P. of 8 articles.
Solution
C.P. of 10 articles = S.P. of 8 articles = ₹ 80 (Suppose)
∴ C.P. of 1 article `= 80/10 = ₹ 8`
and S.P. of 1 article = `80/8 = ₹ 10`
∴ Gain = S.P. - C.P. = ₹ 10 - ₹ 8 = ₹ 2
Gain % = `("Gain" xx 100)/"C.P."`
`= (2 xx 100)/8 = 25%`
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