Year	Quarter	Qtr1	Qtr2	Qtr3	Period	Quarterly Sales Revenue ($1000s)
1	1	1	0	0	1	20
1	2	0	1	0	2	100
1	3	0	0	1	3	175
1	4	0	0	0	4	13
2	1	1	0	0	5	37
2	2	0	1	0	6	136
2	3	0	0	1	7	245
2	4	0	0	0	8	26
3	1	1	0	0	9	75
3	2	0	1	0	10	155
3	3	0	0	1	11	326
3	4	0	0	0	12	48
4	1	1	0	0	13	92
4	2	0	1	0	14	202
4	3	0	0	1	15	384
4	4	0	0	0	16	82
5	1	1	0	0	17	176
5	2	0	1	0	18	282
5	3	0	0	1	19	445
5	4	0	0	0	20	181
Write an equation to forecast sales accounting for seasonality with trend.