Determine 26191

The rectangle has side lengths of a = 40 cm and b = 10 cm. We reduce the length of side a by 30% and the length of side b by 10%. Determine how many% less the area of the rectangle has decreased?

Correct answer:

p =  37 %

Step-by-step explanation:

a=40 cm b=10 cm  q1=130/100=107=0.7 q2=110/100=109=0.9  S1=a b=40 10=400 cm2 S2=(a q1) (b q2)=(40 0.7) (10 0.9)=252 cm2  p=100 S1S1S2=100 400400252=37%



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