a towel , when bleached , lost 10 % of its length and 20 % of its breadth . what is the percentage decrease in area ?
"percentage change in area = ( − 10 − 20 + ( 10 × 20 ) / 100 ) % = − 28 % i . e . , area is decreased by 28 % answer : a"
divide(subtract(multiply(const_100, const_100), multiply(subtract(const_100, 10), subtract(const_100, 20))), const_100)