Discussion
The average monthly income of a family wasRs.5,000 during the first 2 months, Rs.6,000 during the next 4 months and Rs.7,000 during the last 6 months of the years. If the total savings is Rs.10,000, find the average monthly expenditure.
Answer: C
The average monthly expenditure is Rs.5,500. Total income for the year is \[ 2 \times 5000 + 4 \times 6000 + 6 \times 7000 = 76000 \] Savings are 10,000, so expenditure is 66,000 over 12 months, which is 5,500 a month.
Rs.5,000 would leave savings of 16,000, Rs.6,000 would leave 4,000, and Rs.6,500 would leave a deficit of 2,000.
Check: monthly average income is 76000 / 12, about 6,333, and monthly savings are 10000 / 12, about 833, which leaves 5,500 spent.
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