The length and the breadth of a rectangle are made to increase and decrease, respectively, by 8% and 10%. What is the percentage increase or decrease in its area?
Answer & explanation
Correct answer: option 4
We know that,
Area of a rectangle = Length × Breadth
Length = 8% increase = \(\frac{27}{25}\)
Breadth = 10% decrease = \(\frac{9}{10}\)
According to the question,
Length 25 27
Breadth 10 9
--------------------------
250 243
The decrease = 250 - 243 = 7
The decrease percentage = \(\frac{7}{250}\) × 100 = 2.8%