Identify the local molecular geometry and hybridization at atoms a and b in Ritalin, shown below, which is a drug used to treat attention deficit hyperactivity disorder. In the line drawing, the hydrogen atoms bonded to carbon are not shown explicitly. 
Definitions:
Average Variable Cost
The cost of variable inputs (e.g., raw materials and labor) divided by the total output, showing how variable costs change with output levels.
Market Price
The existing rate at which a service or asset is available for purchase or sale in the market.
Marginal Cost
The financial charge for creating one additional unit of a product or service.
Average Variable Cost
The total variable cost divided by the quantity of output produced, representing the cost of producing one more unit.
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