An article costs Rs. $880$ inclusive of $10\%$ sales tax. The price before tax is

An article costs Rs. $880$ inclusive of $10\%$ sales tax. The price before tax is
  1. Rs. $792$
  2. Rs. $800$
  3. Rs. $850$
  4. Rs. $870$

Solution

Pre-tax price $= \dfrac{880 \times 100}{110} = 800$.

Asked in: IMO

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