4 Zeus Computer Chips, Inc., used to have major contracts to produce the 386- and 486-type chips. The market has been declining during the past three years because of the pentium-type chips, which it cannot produce, so Zeus has the unpleasant task of forecasting next year. The task is unpleasant because the firm has not been able to find replacement chips for its product lines. Here is demand over the past 12 quarters:

Use the decomposition technique to forecast the four quarters of 2006.

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2003 2004 2005 4,800 3,500 I 3,200 II 3,500 2,700 II 2,100 III 4,300 III 3,500 III 2,700 IV 3,000 IV 2,400 IV 1,700