If 5% more is gained by selling an article for Rs. 350 than by selling it for Rs. 340, the cost of the article is:________?

A. Rs. 50
B. Rs. 160
C. Rs. 200
D. Rs. 225
Explanation:
Let C.P. be Rs. x.
Then, 5% of x = 350 – 340 = 10
x/20 = 10 => x = 200