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  1. If the diameter of a circle is increased by 8%, then its area is increased by :
    1. 16.64%
    2. 6.64%
    3. 16%
    4. 16.46%
Correct Option: A

Using Rule 10,

Required percentage increase =8 + 8 +
8 × 8
% = 16.64%
100


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