If length L cm and Breadth B cm of a rectangle are increased by 10% to 20% respectively, find the difference between the areas of the old and the new rectangles.

- (2/25)LB
- (3/25)LB
- (7/25)LB
- (8/25)LB

Option 4 : (8/25)LB

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**Given:**

Length ‘L’ and breadth ‘B’.

**Formula used:**

Area of rectangle = length × breadth

**Calculation:**

Old area = length × breadth

⇒ L × B

Length is increased by 10% then new length = 110L/100

Breadth is increased by 20% then new breadth = 120L/100

So, the new area of the rectangle = (110L/100) × (120B/100) = 33LB/25

Difference = (33/25)LB – LB = (8/25)LB

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