Balls are bought at 11 for Rs.10/- and sold at 10 for Rs.11/-. Find the gain or loss percentage?	Choose the correct option:
A) 21 % Profit
B) 22 % Profit
C) 24 % Profit
D) 31 % Profit
E) 32 % Profit
11 balls -----&gt; Rs.10/-   10 balls -----&gt; Rs.11/-   Note: Number of articles bought is must equal to number of articles sold.   10(11 10) ==&gt; 110 100 = Cost price   11(10 11) ==&gt; 110 121 = Selling price   Then, 21/100 × 100 = 21 % Profit   21 % Profit)
<result>A</result>
Balls are bought at 11 for Rs.10/- and sold at 10 for Rs.11/-. Find the gain or loss percentage?