Ram professes to sell his goods at the cost price but he made use of 970 grms instead of a kg, what is the gain percent?  Select the correct option:
A) 11 1/7%  B) 3.09%  C) 11 1/9%  D) 71 1/9%  E) 11 1/2%
970 --- 30   100 --- ? =&gt; 3.09%   Answer:3.09%
<result>B</result>
Ram professes to sell his goods at the cost price but he made use of 970 grms instead of a kg, what is the gain percent?