Create a multiple regression forecasting model that includes a trend component and daily seasonality dummy variables. Use Saturday as your base day. Using this estimated regression equation, make a forecast for all 28 days for which you were given data. What is the MAPE over those forecasts?

Day	Week	Sales Volume (US$ 000s)
Sun	1	9
Mon	1	17
Tue	1	15
Wed	1	19
Thu	1	14
Fri	1	16
Sat	1	8
Sun	2	13
Mon	2	19
Tue	2	15
Wed	2	22
Thu	2	15
Fri	2	20
Sat	2	13
Sun	3	14
Mon	3	20
Tue	3	18
Wed	3	23
Thu	3	19
Fri	3	23
Sat	3	14
Sun	4	18
Mon	4	21
Tue	4	23
Wed	4	24
Thu	4	19
Fri	4	23
Sat	4	15