What is the correct answer?


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%

Correct Answer :

B. 28%

Let original length = x
and original width = y
Decrease in area will be  
                 =xy-80x100×90y100        =xy-1825xy                      =725xyDecrease=7xy25xy×100%                                    =28%

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