Use the following figure to answer the question : Figure 9-4 : shows the marginal cost curve,the average cost curve,the average variable cost curve,and the demand curve for a firm over different levels of output.The market price is $P. 
-Refer to Figure 9-4.The total revenue for the firm at the output level OB is _____.
Definitions:
Class Intervals
The range of values within which a data point in a frequency distribution falls, often represented in grouped data.
Total Frequency
The sum of all counts or occurrences of a particular event or characteristic in a dataset.
Horizontal Axis
The x-axis in a graph, usually representing the independent variable or the categories being compared.
X-axis
The horizontal line on a graph or chart, typically representing the range of values for an independent variable.
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