Question : A man spends Rs. 1,800 monthly on average for the first four months and Rs. 2,000 monthly for the next eight months and saves Rs. 5,600 a year. His average monthly income is:
Option 1: Rs. 2,000
Option 2: Rs. 2,200
Option 3: Rs. 2,400
Option 4: Rs. 2,600
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Correct Answer: Rs. 2,400
Solution :
Sum of expenditure of first 4 months = 4 × 1,800 = 7,200
Sum of expenditure of last 8 months = 8 × 2,000 = 1,6000
Savings = 5,600
We know that,
Total income = expenditure + savings = 7,200 + 16,000 + 5,600 = 28,800
$\therefore$ Monthly income = $\frac{\text{Total income}}{12}=\frac{28800}{12}$ = 2,400
Hence, the correct answer is Rs. 2,400.
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