by selling 88 pens , a trader gains the cost of 22 pens . find his gain percentage ?
let the cp of each pen be rs . 1 . cp of 88 pens = rs . 88 profit = cost of 22 pens = rs . 22 profit % = 22 / 88 * 100 = 25 % answer : a
multiply(divide(22, 88), const_100)