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?  Select the correct option:  A) 127  B) 688  C) 200  D) 121  E) 123

Rationale: "let c . p . be rs . x . then , 5 % of x = 350 - 340 = 10 x / 20 = 10 = > x = 200 answer : c"
Answer: C