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The cost price of 10 books is equal to the selling price of 9 books. Find the gain percent?

A10 1/9%

B9 1/9%

C11 1/9%

D10%

Answer:

C. 11 1/9%

Read Explanation:

Gain% = (x - y) / y * 100%

=(10-9) /9 * 100%

=100/9%

= 11 1/9%


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