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If a man saves 20% of his monthly salary. If on account of increase in prices, he is to increase his monthly expense by 20%, he is only able to save Rs. 800 per month. His monthly salary is:
1. Rs. 40000
2. Rs. 28000
3. Rs. 24000
4. Rs. 20000

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Correct Answer - Option 4 : Rs. 20000

Formula Used:

Savings = Salary – Expenditure

Calculation:

Let the man's monthly salary be x

So, the initial savings = (20/100) × x = 0.2x

Hence, the initial expenses= x – 0.2x = 0.8x

If the expenses increased by 20%, the new expenses = [(100 + 20)/100] × 0.8x = 0.96x

So, the relation for savings becomes:

800 = x – 0.96x

⇒ x = Rs.20000

∴ The man's monthly salary is Rs.20,000

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