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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 -  80 100 x × 90 100 y  = (7/25)xy


 


Decrease % =    (7/25)xy * (1/xy) * 100 = 28%


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