Atorvastatin (structure shown) is the active ingredient in Lipitor,a drug classified as a statin,used for lowering blood cholesterol. Which type of nitrogen heterocycle is present in atorvastatin? 
Definitions:
Total Revenue
The total amount of money received by a company from sales of its products or services, before any expenses are subtracted.
Linear
Pertaining to a relationship or equation that can be graphically represented in a straight line, indicating a constant rate of change.
Upward-Sloping
Describes a line or curve on a graph that increases in height as it moves from left to right, often used to represent the increase in price with an increase in quantity supplied.
Marginal Cost Curve
A graphical representation showing how the cost of producing one more unit of a good changes as the production volume is increased.
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