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Length and breadth of a rectangle are increased by 40% and 70% respectively. What will be the percentage increase in the area of rectangle?
- A118
- B110
- C138
- D128
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CCommunity
Let Length and breadth of rectangle be a and b respectively
Initial area = length × Breadth = ab
New length = a + 40% of a = 1.4a
New breadth = b + 70% of b = 1.7b
New area = (1.4a) × (1.7b) = 2.38ab
∴ Required % = {(2.38ab – ab/ab} × 100 = 138%
Initial area = length × Breadth = ab
New length = a + 40% of a = 1.4a
New breadth = b + 70% of b = 1.7b
New area = (1.4a) × (1.7b) = 2.38ab
∴ Required % = {(2.38ab – ab/ab} × 100 = 138%