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:

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