If I purchased 11 books for Rs. 10 and sold all the books at the rate of 10 books for Rs. 11, the profit percent is

10%

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11%

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21%

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100%

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Solution

The correct option is C 21%
Suppose, the number of books purchased is
C.P. of 110 books

$= R s . (\frac{10}{11} \times 110)$
= Rs. 100

S.P. of 110 books =
$R s (\frac{11}{10} \times 110)$

= Rs. 121, Profit % = 21 %.

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