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  1. The percentage increase in the surface area of a cube when each side is doubled is
    1. 50%
    2. 200%
    3. 150%
    4. 300%
Correct Option: D

Using Rule 10,
Required percentage increase

Required percentage increase = x + y +
xy
 %
100

= 100 + 100 +
100 × 100
 % = 300%
100


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