1 .

If the cost price of 15 articles is equal to the selling price of 12 articles, the profit percentage is

[ A ]    25%
[ B ]    20%
[ C ]    18%
[ D ]    15%
 Answer : Option A Explanation : Profit % = $15 - 12 \over 12$ $\times$ 100 = $3 \over 12$ $\times$ 100 = 25 %