Area Q19

19. 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:

A.10%                                  B.10.08%

C.20%                                   D.28%

Answer: Option D

Explanation:

Let original length = x and original breadth = y.

Decrease in area	= xy - 80 x x 90 y 100 100
	= xy - 18 xy 25
	= 7 xy. 25

Decrease % =		7	xy x	1	x 100	%	= 28%.
		25		xy