Earning in the remaining 8 months = 7000 × 8 = ₹56000 Earning in March, May, July, December (4 months) = (7000 × 8/5) × 4 = ₹44800 ⇒ Total earnings (12 months) = 56000 + 44800 = ₹100800 Savings in the remaining 8 months = 4000 × 8 = ₹32000 Savings in March, May, July, and December (4 months) = (4000 × 5/2) × 4 = ₹40000 ⇒ Total savings (12 months) = 32000 + 40000 = ₹72000 ∴ Total expenditure (12 months) = 100800 - 72000 = ₹28800 ⇒ Average expenditure per month = 28800/12 = ₹2400
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