Suppose the total cost of producing 10,000 tennis balls is $30,000, and the fixed cost is $10,000. What is the variable cost? $ 20000 . (Enter a numeric response using an integer.) When output is 10,000, what is the average variable cost? $| (Enter a numeric response using a real number rounded to two decimal places.) When output is 10,000, what is the average fixed cost? $ . (Enter a numeric response using a real number rounded to two decimal places.) Assuming that the cost curves have the usual shape, the dollar difference between average total costs and average variable costs as output increases