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2015-05-02T17:28:18+05:30

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9 pencils  for Rs 16
1 pencil costs    Rs 16/9

11 pencils cost  11 * Rs 16/9 =  Rs 176/9
11  pencils are sold at  Rs 22 =  Rs  198/9

So profit  =  198/9  - 176 / 9 =  Rs  22/9

profit %  =  (22/9)  /  (176/9)  * 100  = 22 /176  * 100 =  12.5 %

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