Answer: The average variable cost is $3.(D)
Step-by-step explanation:
A fixed cost is a cost that does not change or varies with production process. Fixed costs are always constant in production. Variable costs are costs that changes with the production process. Variable costs varies and are not constant.
From the information given in the question, the firm produces 300 units of output, has a total cost of $1000 and a fixed cost of $100. A total cost is made up of the fixed and variable cost.
Total cost= Fixed cost+Variable cost
Since total cost is $1000 and fixed cost is $100, variable cost will be $1000 - $100 = $900
Since the firm produces 300 units and variable cost is $900, average variable cost will be: $900/300 =$3
The average variable cost is $3