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If the length and breadth of a rectangle are decreased by 10%, then by what per cent does the area decrease?
  • a)
    19%
  • b)
    25%
  • c)
    10%
  • d)
    20%
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If the length and breadth of a rectangle are decreased by 10%, then by...
Length becomes 0.9L.
Breadth becomes 0.9B.
Area = 0.9L x 0.9B = 0.81LB.
∴ Area decreases by 19%.
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If the length and breadth of a rectangle are decreased by 10%, then by what per cent does the area decrease?a)19%b)25%c)10%d)20%Correct answer is option 'A'. Can you explain this answer?
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