Question : The ratio of monthly income and expenditure of a man is 7 : 3. If his expenditure is INR 5,400, find his monthly income.
Option 1: INR 12,600
Option 2: INR 13,300
Option 3: INR 11,500
Option 4: INR 10,400
Correct Answer: INR 12,600
Solution :
Given: The ratio of monthly income and expenditure of a man = 7 : 3
Expenditure = INR 5,400
Let monthly income be $7x$ and monthly expenditure be $3x$
According to the question:
$3x=5400$
⇒ $x=1800$
Thus, monthly income $=7x=7\times1800 = 12600$
Hence, the correct answer is INR 12,600.
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