You are given the following information on items A, B, C, and D. 
The weighted aggregate quantity index when 2005 is used as the base and prices are used as weights is
Definitions:
Product Differentiation
The procedure of differentiating a product or service among its market competitors to make it more appealing to an intended target market.
Purely Competitive Market
A market structure characterized by many buyers and sellers, freedom of entry and exit, and a product that is homogeneous across producers.
Equilibrium Price
The price at which the quantity of goods supplied is equal to the quantity of goods demanded; the market price where no surplus or shortage exists.
Marginal Revenue
The additional income earned from selling one more unit of a good or service; it's a crucial concept for understanding how firms decide on output levels.
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