The food service at Goldey Beacom College provides lunch and dinner for the students Monday through Friday. The food service manager would like to forecast the sales for each day of the following week to ensure she has enough employees staffing the counter. The following data show the daily sales, in dollars, for the last three weeks. These data can also be found in the Excel file cafeteria. xlsx.

a. Construct a graph showing the food service’s daily sales over time.

b. Forecast the sales for each day next week using multiplicative decomposition.

c. Interpret the meaning of the seasonal components. 

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Day Monday Tuesday Wednesday 726 Thursday Friday Daily Sales () Week 1 Week 2 Week 3 718 561 740 502 587 657 563 728 550 809 523 633 539 530