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In quantity index ΣQ₁P₀ / ΣQ₀P₀ × 100, the weights are
ACurrent period prices
BBase period prices
CCurrent period quantities
DGeometric means
Answer & Solution
Correct answer: B. Base period prices
1. Quantity index using base-period prices: ΣQ₁P₀ / ΣQ₀P₀ × 100 (Laspeyres-type).
2. Weights = base-period prices, applied to current and base period quantities.
3. It isolates change due to quantity by holding prices fixed.
4. Hence (B) is correct.
_Source: Maharashtra Balbharati Std XII Mathematics & Statistics (Commerce), Ch 3 "Quantity and Value Index", §3.7 ¶§3.7_
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