CPI Impact from Weighted Price Changes

Steps:

• Identify the contribution of each item to CPI as (weight × percentage price change).
• Compare these contributions across all items.
• Select the item with the highest contribution.
• Not enough information: Table of weights and price changes is missing, preventing calculation.

Why A is correct:

• Food would be correct if its weighted price change is largest, per CPI formula where index = Σ (weight_i × price change_i).

Why the others are wrong:

• B: Housing's contribution is smaller than food's weighted change.
• C: Recreation's contribution is smaller than food's weighted change.
• D: Transport's contribution is smaller than food's weighted change.

Final answer: A