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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:

Correct Answer: 28%

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


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