Costco sells paperback books in their retail stores and wants to examine the relationship between the prices and sales. The price of a particular novel was adjusted each week and the weekly sales are in the following table. Management would like to use a simple linear regression model that uses prices to predict sales. 
The predicted weekly sales for the novel when priced at $10 is equal to ________.
Definitions:
Purchase Price
The amount of money paid to buy goods or services.
Ordering Supplies
The process of requesting and acquiring necessary materials or stock for business operations, production, or office maintenance.
Large Demand
A significant consumer interest or need for a product or service which often leads to high sales volume.
Expiration Dates
The specified dates after which a product, especially food or medicine, is not guaranteed to be safe or effective and should not be used.
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