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1. The length of a rectangle is twice than that of its breadth. If the length of the rectangle is increased by 10%, while its breadth is decreased by 10% what is the percentage change in the perimeter ?
- A. 3 1/3%
- B. 3 1/3%
- C. 3 1/3%
- D. 3 1/3%
Answer: Option A
Explanation:
ধরি, breadth x unit
length 2x unit
Perimeter 2 ( 2x + x) unit = 6x unit
10% বৃদ্ধিতে , breadth ( x - 10x/100) = 9x/10 unit
10% বৃদ্ধিতে length ( 2x + 120x/100) = 11x/5
Perimeter 2 ( 9x/10 + 11x/5) unit = 2 ×31x/10 = 31x/5
Perimeter বৃদ্ধির হার ( 31x /5 - 6x / 6x × 100%) = 3 1/3 %
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