develop a multiplicative decomposition model for Luiss sales data. Use the model to forecast revenues for year 5 and comment on the validity of the model. Show steps in excel how to complete

Year	Quarter	Sales ($M)
1	1	42.9
	2	48.5
	3	54.1
	4	74.1
2	1	43.8
	2	50.3
	3	57.8
	4	79.8
3	1	49.0
	2	54.2
	3	59.3
	4	83.3
4	1	51.3
	2	58.2
	3	62.9
	4	88.5