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  1. The length and breadth of a rectangle are increased by 20% and 25% respectively. The increase in the area of the resulting rectangle will be :
    1. 60%
    2. 50%
    3. 40%
    4. 30%
Correct Option: B

Using Rule 10,

Net Effect on area of rectangle =20 + 25 +
20 × 25
% = 50%
100

∵ Net % change =
a + b + ab
 %
100


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