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Area - General Aptitude

Q1:

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 10%

B 10.08%

C 20%

D 28%

ANS:D - 28%

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