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:
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
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