I need the following questions worked out in steps.

A plastics manufacturer performed a quarterly time series analysis for demands over the last five years (periods 1 through 20). The analysis resulted in the trend equation and seasonal indexes shown below. Y hat = 920.0 + 22.6 t

1. Based on the seasonal indexes, which quarter is expected to have 4% more demand than predicted by the trend line and why?

2. What is the demand amount if t = 10 by considering quarterly impacts, too?

Quarter	Index
1	0.75
2	1.04
3	1.21
4	1.00