If the length and breadth of a rectangle are changed by +20% and by -10%…
2026
If the length and breadth of a rectangle are changed by +20% and by -10% respectively, then what shall be the percentage change in the area of the rectangle?
Answer: D. 8%increase — To find the percentage change in area, apply the formula x + y + (xy/100). Substituting length change of 20% and breadth change of -10%, we get 20 + (-10) +…
- A.
4% decrease
- B.
4% increase
- C.
8%decrease
- D.
8%increase
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Correct answer: D
To find the percentage change in area, apply the formula x + y + (xy/100).
Substituting length change of 20% and breadth change of -10%, we get 20 + (-10) + (20 * -10)/100 = 8%.
A positive result indicates an 8% increase in the area.
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