a towel , when bleached , lost 20 % of its length and 20 % of its breadth . what is the percentage decrease in area ?
"percentage change in area = ( − 20 − 20 + ( 20 × 20 ) / 100 ) % = − 36 % i . e . , area is decreased by 36 % answer : b"
divide(subtract(multiply(const_100, const_100), multiply(subtract(const_100, 20), subtract(const_100, 20))), const_100)