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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 ?

A. 27%

B. 28%

C. 29%

D. 30%

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Correct Answer :

B. 28%

Let original length = x
and original width = y
Decrease in area will be

= x y - (\frac{80 x}{100} \times \frac{90 y}{100}) = (x y - \frac{18}{25} x y) = \frac{7}{25} x y D e c r e a s e = (\frac{7 x y}{25 x y} \times 100) % = 28 %

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