Find percentage of increase: Marks in a test increased from 20 to 30.

66%

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50%

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33%

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Solution

The correct option is B 50%
Marks before increase $= 20$
Marks after increase $= 30$
Marks increased $= 30 - 20 = 10$
Percentage of increase $= \frac{10}{20} \times 100 % = 50 %$

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