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 variable cost for the firm at output level OB is _____.
Definitions:
Explanatory Variables
Variables in a statistical model that are used to explain variation in the response variable; also known as independent variables.
Response Variable
The variable in a study that responds or is presumed to change due to the influence of another variable.
Weakest Correlation
The situation where two variables have the smallest degree of linear relationship between them, often near zero.
Malaria Cases
The number of individuals diagnosed with malaria during a given time period.
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