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30% of a number is 21. What percent of the number is 49?
  1. 75%
  2. 65%
  3. 70%
  4. None of these
Explanation

30% of x = 21 → (30/100) × x = 21 → x = 21 × (100/30) = 70

Now find what percent 49 is of 70: (49 / 70) × 100 = 70%

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If an article is sold at a profit of RS 120, which represents 20% of the selling price, then what is the cost price of the article?
  1. 500
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  3. 480
  4. 976
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