Ram paid a sum of money for purchasing 25 pens, which he recovered in full when he sold 10 of them. What was his percentage of profit or loss per pen?	Choose one: A) 80% B) 125% C) 100% D) 70% E) 90%
B   125%   If the sum he paid whilst purchasing 25 pens = A,   Then the Cost Price of each pen = A/25.   Since the amount he got whilst selling 10 pens is also = A   Then the Selling Price of each pen = A/10.   Since Selling Price &gt; Cost Price, he made a profit.   Profit per pen = Selling Price - Cost Price = A/10 - A/25 = 3A/50.   Profit percentage per pen = Profit per pen / Cost per pen x 100 = (3A/60) / (A/25) x 100 = 125%. Answer :125%
<result>B</result>
Ram paid a sum of money for purchasing 25 pens, which he recovered in full when he sold 10 of them. What was his percentage of profit or loss per pen?