Find (a) the dot product of the two vectors and (b) the angle between the two vectors. 
and 
Definitions:
Total Sales
The aggregate revenue received from selling goods or services over a given period of time.
Complement
A good or service that is used together with another, where the use or consumption of one increases the value or demand of the other.
Inter-relatedness
The condition or fact of being connected and having reciprocal effects or influences among components or variables.
Demand
The willingness and ability of consumers to purchase a particular quantity of goods or services at a given price and time.
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