Question

The salary of a person was increased by 15%.if his salary now is ₹9936,what was his intitial salary?

Answer 1

New salary after increase = Rs. 9936
Let x be the Initial salary 
Initial salary + 15% of initial salary = New Salary
x+15%(x) = 9936
x+(15/100)(x) = 9936
x+(3/20)(x) = 9936
x+3x/20 = 9936
(20x+3x)/20 = 9936
23x = 9936*20
23x = 198720
x = 198720/23
x = 8640 
Rs. 8640 was his initial salary. 

Answer 2

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

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 xD