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Question

A price index two items of A and B is being estimated. If two items are assigned weights of 64 and 36 respectively, the price index becomes 279. Similarly, if they are assigned weights of 50 each, the price index turns out to be 265. Determine the individual price index numbers of items A and B.

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Solution

There are two situations in the given condition. Let I1 be the index for the first item and I2 be the index for the second item.

First Situation:279=64I1+36I264+36Second Situation:265=50I1+50I250+50 [P01=I1W1+I2W2W1+W2] ...(i)

From (i), 64I1+36I2=2790016I1+9I2=6975

From (ii), I1+I2= 530

Solving (iii) and (iv), we get I1 = 315, I2 = 215


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