(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:
Variable Costs
Costs that change in proportion to the level of activity or volume of production in a business, such as materials and labor.
Activity Variance
The difference between a revenue or cost item in the flexible budget and the same item in the static planning budget. An activity variance is due solely to the difference between the actual level of activity used in the flexible budget and the level of activity assumed in the planning budget.
Flexible Budget
A report showing estimates of what revenues and costs should have been, given the actual level of activity for the period.
Static Planning Budget
is a budget based on a fixed level of activity and does not change with actual activity levels, useful for planning but less so for performance evaluation.
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