Find the equation of the normal line to the given surface at the specified point. 
Definitions:
Sale Price
The actual price at which an item or service is sold to the consumer, often reduced from its original or list price.
New Furniture
Recently manufactured items intended to support various human activities such as seating, eating, and sleeping.
Opportunity Cost
The value of the best alternative forgone where a choice needs to be made between several mutually exclusive alternatives.
Aggregate Income
The total amount of income earned by all individuals or entities within an economy.
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