(a) Using the data from graph, calculate the firm's total profit. (b) If the firm operates at optimum efficiency, how much will its output be? (c) If the firm were a perfect competitor, how much will its price be in the long run? 
Definitions:
Marginal Cost
The increase in total cost that arises from an extra unit of production, pivotal for decision-making in production processes.
Diminishing Returns
A principle stating that as more of a variable input is combined with a fixed input, the incremental gains in output will eventually decrease.
Increasing Returns
This refers to a scenario in economics where, as the quantity of input increases, the rate of output increases at a faster rate, leading to economies of scale.
Long-Run Total Cost
The aggregate cost of production when all factors of production are variable and the scale of operation can change.
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