In the month of April, Rahul’s average expenditure for the first 10 days was Rs 800 per day. If his average expenditure for the next 10 days decreases by Rs 25 after every 10 days and he earns Rs 25,000 per month. Calculate his savings in the month of April.
Correct Answer: Option E
Average expenditure of days 1 to 10 = Rs 800
Total expenditure for days 1 to 10 = Rs 800 × 10 = 8000
⇒ Total expenditure for days 11 to 20 = Rs (800 – 25) × 10
= Rs 775 × 10
= Rs 7750
⇒ Total expenditure for days 21 to 30 = Rs (775 – 25) × 10
= Rs. 750 × 10
= Rs. 7500
∴ Total expenditure = Rs (7500 + 7750 + 8000)
= Rs. 23250
Now, we know that,
⇒ Savings = Income – Expenditure
= Rs 25000 – Rs 23250
= Rs 1750
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