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Q.
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.
0.1
B.
10.08%
C.
0.2
D.
0.28
View Answer
Correct choice: D
Explanation:
Let original length = x and original breadth = y. Decrease in area = xy -[(80/100x) * (90/100y)] =[(xy-(18/25)xy)] =(7/25)xy Decrease % =[(7/25)xy * (1/xy) * 100] =28%
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