if the selling price of 50 articles is equal to the cost price of 25 articles , then the loss or gain percent is :
"c . p . of each article be re . 1 . then , c . p . of 50 articles = rs . 50 ; s . p . of 50 articles = rs . 25 . loss % = 25 / 50 * 100 = 50 % answer e"
subtract(50, 25)