On the basis of quartely sales (in lakhs) of a certain commodity for the years 2003-2004 following calculations were made: Y = 20 +0.5 r with origin at 1st quarter of 2003. %3D Are = time unit = one quarter and Y= quarterly sales (in $) Seasonal variations. Quarter I i iii iv Seasonal index 80 90 120 110 Estimate the quarterly sale for the year 1990 using multiplicative model.

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