The sides 6

The sides of the rectangle are 12cm and 15cm. How many percent will the area of the rectangle increase if we increase each side by 10%?

Correct answer:

p =  21 %

Step-by-step explanation:

a=12 cm b=15 cm  q=100%+10%=1+10010=1.1  x=q a=1011 a=1.1 12=566=13.2 cm y=q b=1011 b=1.1 15=233=16.5 cm  S1=a b=12 15=180 cm2 S2=x y=566 233=5 266 33=102178=51089=217.8 cm2  p=100 S1S2S1=100 S151089S1=100 180217.8180=21%

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