The cost price of 13 articles is equal to the selling price of 11 articles. Find the profit percent? Pick:
A) 18 9/11% B) 18 2/11% C) 18 2/81% D) 19 2/11% E) 38 2/11%
13 CP = 11 SP   11 --- 2 CP   100 --- ? =&gt;18 2/11%   Answer: 18 2/11%
<result>B</result>
The cost price of 13 articles is equal to the selling price of 11 articles. Find the profit percent?