If the length and the breadth of a rectangle are increased by 15% and 20%, respectively, then by how much percent the area of the rectangle will increase?
Answer & explanation
Correct answer: option 2
Let the length and breadth of the rectangle = 100
According to the questions,
Length increase 15% = 115,
Breadth increase 20% = 120
Old area = 100 × 100 = 10000
New area = 115 × 120 = 13800
Percentage change = \(\frac{13800 - 10000}{10000 }\) × 100 = 38%