An article marked at Rs. $4{,}500$ is sold for Rs. $3{,}600$. The rate of discount is

An article marked at Rs. $4{,}500$ is sold for Rs. $3{,}600$. The rate of discount is
  1. $15\%$
  2. $18\%$
  3. $20\%$
  4. $25\%$

Solution

Discount $= 4500 - 3600 = 900$. Rate $= \dfrac{900}{4500} \times 100\% = 20\%$.

Asked in: IMO

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