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The ratio of A's salary to that of B was 4 : 5. A's salary got increased by 10% and B's salary got increased by 20%. What is the ratio of A's salary to that of B now?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
11 : 15

Salary Ratio Calculation Steps

This problem involves calculating the new ratio between two salaries after applying percentage increases.

Initial Salary Ratio

Let the initial salaries of A and B be $4x$ and $5x$ respectively, based on the given ratio of 4:5.

Calculating New Salaries

A's salary is increased by 10%:

  • Increase amount = $10\% \times 4x = 0.10 \times 4x = 0.4x$
  • A's new salary = $4x + 0.4x = 4.4x$

B's salary is increased by 20%:

  • Increase amount = $20\% \times 5x = 0.20 \times 5x = 1.0x$
  • B's new salary = $5x + 1.0x = 6.0x$

Determining the New Ratio

The new ratio of A's salary to B's salary is calculated by dividing their new salaries:

  • New Ratio = $\frac{\text{A's new salary}}{\text{B's new salary}} = \frac{4.4x}{6.0x}$
  • Simplify the ratio: $\frac{4.4}{6.0} = \frac{44}{60}$
  • Further simplify by dividing both numbers by their greatest common divisor (4): $\frac{44 \div 4}{60 \div 4} = \frac{11}{15}$

Therefore, the new ratio of A's salary to B's salary is 11:15.

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