The market supply curve of rubber erasers is given by 
The demand for rubber erasers can be segmented into two components. The first component is the demand for rubber erasers by art students. This demand is given by 
The second component is the demand for rubber erasers by all others. This demand is given by 
Derive the total market demand curve for rubber erasers. Find the equilibrium market price and quantity. Also, determine the consumer surplus for each component of demand.
Definitions:
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