If 5% more is gained by selling an article for Rs. 420 than by selling it for Rs. 380, the cost of the article is?
Pick.
A) 500
B) 688
C) 200
D) 121
E) 800

Rationale: let c . p . be rs . x . then , 5 % of x = 420 - 380 = 40 x / 20 = 40 = > x = 800 answer : e
Answer: E