if 4 % more is gained by selling an article for rs . 350 than by selling it for rs . 340 , the cost of the article is
"explanation : let c . p . be rs . x . then , 4 % of x = 350 - 340 = 10 x / 25 = 10 = > x = 250 answer : a"
divide(subtract(350, 340), divide(4, const_100))