Question

Average monthly expenditure for January--June is ₹ 3200. He spends ₹ 3000 (July), ₹ 3600 (Aug), ₹ 3900 (Sept), ₹ 4200 (Oct). If November’s expenditure is $50%$ of December’s and the average for the entire year is ₹ 3200, find November’s expenditure.

• A. 1600
• B. 1400
• C. 1700
• D. 1500

Hint:

With averages across periods, convert to totals first; then apply given ratios (here, $N=\tfrac{1}{2}D$) to split the remainder.