A towel, when bleached, was found to have lost 20% of its length and 10% of its breadth.The percentage of decrease in area is :	Choose one:
A) 13 % B) 14 % C) 18 % D) 20 % E) 28 %

Rationale: let original length = x and original breadth = y . decrease in area = xy - ( 80 / 100 * x * 90 / 100 * y ) = ( xy - 18 / 25 * xy ) = 7 / 25 * xy . decrease % = ( 7 / 25 * xy * 1 / xy * 100 ) % = 28 % . answer is e
Answer: E