The length and breadth of a rectangle field are increased, the area increased by 50%. If the length increased by 20%, by what percentage was breadth increased?
Explanation:
Length becomes 1+20100 = 65 times. Area becomes 1+50100 = 32 times.
∴ Area = Length × Breadth
⇒ 32 = 65 × Breadth
⇒ Breadth becomes 5/4 times. ∴ Breadth increases by 54-1 × 100% = 25%
Hence, option (a).
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