Question

the salary of a person was increased by 15/ if salary now is 9936what was it until salary

Answer 1

115% = 9936 ( due to the increase of 15 % )

out original salary = 100%

then

Original salary is = 9936/115×100
answer is 8640

Answer 2

$\huge\purple{\fbox{\fbox{\red{\mathcal{solution}}}}}$

let the initial salary be X

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

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

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

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

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

$= > x = 9936 \times \frac{20}{23}$

$= > x = 432 \times 20$

$= > x = 8640(ans)$

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hope this helps you