A shopkeeper marks his goods 30% above his cost price but allows a discount of 10% at the time of sale. His gain is = ?

A. 21%

B. 20%

C. 18%

D. 17%

Answer: Option D

Solution(By Examveda Team)

Let the cost price of goods = Rs. 100
Mark price of goods = Rs. 130 (30% discount)
Selling price of goods = 90% of 130 = Rs. 117
Gain = 117 - 100 = Rs. 17
$${\text{Gain}}\% = \frac{{17}}{{100}} \times 100 = 17\% $$