Question

50 points question.

if by selling 90 articles, shopkeeper gains S.P of 9 articles, find profit%.

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Answer 1

$p = sp - cp \\ 9sp = 90sp - 90cp \\ 90cp = 81sp \\ \frac{cp}{sp} = \frac{81}{90} = \frac{9}{10 } \\ sp = 10 \\ cp = 9 \\ p= 1 \\ p\% = \frac{1}{9} \times 100 = 11 \times \frac{1}{9} \%$