If 5% more is gained by selling an article for Rs. 350 than by selling it for Rs. 345, the cost of the article is
Choose the correct choice from the following answers:
A) 289 B) 231 C) 100 D) 288 E) 111

Rationale: "explanation : let c . p . be rs . x . then , 5 % of x = 350 - 345 = 5 x / 20 = 5 = > x = 100 answer : c"
Answer: C