The cost price of 13 articles is equal to the selling price of 11 articles. Find the profit percent?	Choose the correct option:
A) 18 2/7%  B) 18 2/11%  C) 12 2/12%  D) 13 2/9%  E) 14 2/7%
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?