Calculate the index number for the year 1979 with 1970 as base from the following data using weighted average of price relatives :

Question

Commodity	Weights	Price in Rs.
		1970	1979
A	22	2.50	6.20
B	48	3.30	4.40
C	17	6.25	12.75
D	13	0.65	0.90

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