The salary of a person was increased by 15%. If his salary now is ₹ 9,936, what was his initial salary?(7th class math)

The salary of a person was increased by 15%. If his salary now is ₹ 9,936, what was his initial salary?(7th class math).

Solution:Let initial Salary = x

   According to question,salary increased by 15%

  then,X x (100 + 15) = 9936

                                 X = 9936/115

                                 X = 8640

Therefore,initial salary 8640.