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?
- A.
4% decrease
- B.
4% increase
- C.
8%decrease
- D.
8%increase
Attempted by 112 students.
Show answer & explanation
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.