Percent change

If the length of a rectangle is increased by 25% and the width is decreased by 10%, the area of the rectangle is larger than the area of the original rectangle by what percent?

Correct result:

p =  12.5 %

Solution:

q1=1+25/100=54=1.25 q2=110/100=910=0.9  S1=ab S2=(a q1) (b q2)  p=100 S2S1S1  p=100 (a q1) (b q2)abab  p=100 q1 q211=100 1.25 0.911=252=252%=12.5%



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