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Mr. X spends 40% of his monthly salary on food, 10% on clothes, 15% on house rent and invests 20%. After all these, he is left with Rs. 12900. What is his total monthly income?
1. Rs. 90000
2. Rs. 86000
3. Rs. 88000
4. Rs. 84000

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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".  

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