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### Discussion :: Area

1. 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:

2.  A. 10% B. 10.08% C. 20% D. 28%

Explanation :

Let original length = x and original breadth = y

Decrease in area =XY-[$$\frac { 80} { 100 }$$xx$$\frac { 90 } { 100 } Y]$$

=[xy-$$\frac { 18 } { 25 }XY ]$$

=$$\frac { 7 } { 2 5}$$xy

Decrease % =[$$\frac { 7 } { 2 5}$$xy x $$\frac { 1 } { XY }$$x100]%=28%

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