Weighted Price Index Calculation Requires All Expenditure Weights Steps:

• Identify expenditure weights from ratio 2:1:3 for food, clothing, accommodation, and transport; total parts sum to 6, but four categories imply incomplete ratio for transport.
• Note price changes: food +10%, clothing +4%, accommodation +10%, transport +0%.
• Compute index increase using Laspeyres formula: % change = ∑ (weight_i × price change_i), where weights sum to 1.
• Recognize transport weight is unspecified, preventing normalization of weights and exact calculation.

Not enough information.

Why B is correct:

• N/A; cannot verify without complete weights.

Why the others are wrong:

• A: Underestimates by ignoring full weighted impact.
• C: Overstates by averaging only inflating categories.
• D: Exaggerates total change without dilution from constant transport.

Final answer: Not enough information.