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The salary of the clerk is increased by 30%. By what percent must the increased salary be decreased in order to restore it to the former amount?
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The salary of the clerk is increased by 30%. By what percent must the ...
To determine the percentage decrease required to restore the increased salary of a clerk back to its original amount after a 30% increase, follow these steps:
Understanding the Salary Increase
- Let the original salary be represented as S.
- After a 30% increase, the new salary becomes:
  • Increased Salary = S + (30/100) * S = S * (1 + 0.30) = 1.30S


Calculating the Required Decrease
- To find out by what percentage the increased salary (1.30S) must be decreased to return to the original salary (S), we set up the equation:
  • Let the required decrease percentage be x.
  • Decreased Salary = Increased Salary - (x/100) * Increased Salary
  • S = 1.30S - (x/100) * 1.30S


- Simplifying the equation gives:
  • S = 1.30S * (1 - x/100)
  • 1 = 1.30 * (1 - x/100)


Solving for x
- Rearranging the equation:
  • 1 = 1.30 - 1.30x/100
  • 1.30x/100 = 1.30 - 1
  • 1.30x/100 = 0.30


- Multiplying both sides by 100 and dividing by 1.30:
  • x = (0.30 * 100) / 1.30
  • x ≈ 23.08


Conclusion
- Therefore, to restore the salary back to its original amount after a 30% increase, it must be decreased by approximately 23.08%.
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The salary of the clerk is increased by 30%. By what percent must the increased salary be decreased in order to restore it to the former amount?
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