The solution gives the calculation of seasonal index in the sales of electronic equipment and home appliances.

The Appliance Center sells a variety of electronic equipment and home appliances. For the last four years the following quarterly sales (in $ millions) were reported.

Quarter
Year I II III IV
2000
5.3
4.1
6.8
6.7
2001
4.8
3.8
5.6
6.8
2002
4.3
3.8
5.7
6.0
2003
5.6
4.6
6.4
5.9

Determine a typical seasonal index for each of the four quarters.