Rectangle area

The length of a rectangle of x units is increased by 10% and its width of y units is increased by 15%. What is the ratio of the area of the old rectangle to the area if the new rectangle?

Correct result:

r =  1.265
p =  26.5 %

Solution:

a2=1.10 a1 b2=1.15 b1 S1=a1 b1 S2=a2 b2=1.10 a1 1.15 b1 S2=1.10 1.15 S1 r=1.10 1.15=253200=1.265
p=100 (r1)=100 (1.2651)=532=532%=26.5%



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