The ratio of cost price and selling price of an article is 20 : 21. The gain percent on it is = ?

A. 4

B. 5

C. 6

D. 10

Answer: Option B

Solution(By Examveda Team)

According to the question,
$$\eqalign{ & \frac{{{\text{CP}}}}{{{\text{SP}}}} = \left. {\frac{{20}}{{21}}} \right) + 1 = {\text{Profit}} \cr & {\text{Profit }}\% = \frac{1}{{20}} \times 100 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 5\% \cr} $$