Exhibit 11.17
The following questions use the data below.
A store wants to predict quarterly sales. The owner has collected 3 years of sales data and wants your help in analyzing the data using the additive seasonal method. 
-Refer to Exhibit 11.17. What formulas should go in cells E3:G16 of the spreadsheet if the additive seasonal method is used to forecast sales?
Definitions:
Closed Economy
An economic system that does not engage in international trade with outside countries and relies wholly on its own resources.
Loanable Funds
The funds available for borrowing in the financial markets, consisting of savings and sometimes bank loans that are available to be lent to businesses and individuals.
Interest Rate
The rate at which borrowers are charged for accessing assets, specified as a percentage of the original sum borrowed.
Desired Saving
The portion of income that households choose to save rather than spend on consumption.
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