Question

The salary of a person was increased by 15%.If his salary now is 9936,what was his initial salary.

Answer 1

let his salary is x

increase = 15% = 15x/100

x + 15x/100

According to the given question

His salary now = Rs 9936

= x + 15x/100 = 9936

= 100x + 15x/100 = 9936

= 115x /100 = 9936

= 115x = 9936 x 100

= 115x = 993600

= x = 993600/115

X = 8640.

Hence , initial salary is Rs 8640 .

Check -

8640 x 15/100 = 1296 .

8640 + 1296 = 9936 .

$\bold{Initial \: Salary \: = \: Rs \: 8640}$

Answer 2

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let the initial salary be x

$x + 15\% \: of \: x = 9936$

$\frac{x}{1} + \frac{15}{100} \times x = 9936$

$\frac{x \times 100}{1 \times 100} + \frac{15x}{100} = 9936$

$\frac{100 + 15x}{100} = 9936$

$\frac{115x}{100} = 9936$

$x = 9936 \times \frac{100}{115}$

$x = 20 \times 432$

$= > x = 8640$