Salary increases by $20\%$ to Rs. $36000$. Original salary was

Salary increases by $20\%$ to Rs. $36000$. Original salary was
  1. Rs. $30000$
  2. Rs. $28800$
  3. Rs. $7200$
  4. Rs. $30200$

Solution

$1.2x = 36000 \Rightarrow x = 30000$.

Asked in: IMO

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