The price of a book is increased from Rs. $150$ to Rs. $180$. The percentage increase is

The price of a book is increased from Rs. $150$ to Rs. $180$. The percentage increase is
  1. $15\%$
  2. $18\%$
  3. $20\%$
  4. $30\%$

Solution

Increase $= 180 - 150 = 30$. Percent increase $= \dfrac{30}{150} \times 100\% = 20\%$.

Asked in: IMO

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