The actual area of a rectangle is 60 cm2, but while measuring its length a student decreases it by 20% and the breadth increases by 25%. The percentage error in area, calculated by the student is :
a) 5 %
b) 15 %
c) 20 %
d) No change
Answer: d
Explanation: 100 === 25% ↑===> 125 ===> 20% ↓===> 100
So, there is no change in the area of rectangle
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