A towel, when bleached, lost 20% of its length and 10% of its breadth. What is the percentage decrease in area?  Answers:
A) 26	B) 28	C) 24	D) 20	E) 22

Rationale: "formula for percentage change in area is : = ( − x − y + ( xy ) / 100 ) % = ( − 20 − 10 + ( 20 × 10 ) / 100 ) % = − 28 % i . e . , area is decreased by 28 % answer is b ."
Answer: B