The quarterly sales for a small leather manufacturer during the years 2005 to 2007 is shown in the table below: Year Quarterly sales in million          I    II III IV 2005 14 15 17 17 2006 15 16 18 19  2007 18 20 23 25 (i) Calculate a 4 moving average for the above data. (ii) Deseasonalize these sales using a multiplicative model.

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