Correct Answer - Option 1 : Rs. 90000
Let, the salary of Mr. X be Rs"Y".
As per the question,
He spent 40% of his salary on food, 10% on clothes, 15% is house rent and investment is 20%.
Therefore, the correct spending will be:
⇒ 40% + 10% + 15% + 20%.
⇒ 85% of salary.
⇒ 0.85Y.
Now remaining salary will be:
⇒ Y - 0.85Y.
⇒ 0.15Y.
As the question, the remaining salary is Rs. 12900.
Therefore,
⇒ 0.15Y = 12900.
⇒ Y = 12900 ÷ 0.15.
⇒ Y = 86000.
As the value of Y is Rs.86000.
Therefore, the correct answer should be "Option2: Rs. 86000".