Suppose the total cost of producing 20,000 tennis balls is $30,000, and the fixed cost is $5,000. What is the variable cost? $|:|. (Enter a numeric response using an integer.) When output is 20,000, what is the average variable cost? $|:|. (Enter a numeric response using a real number rounded to two decimal places.) When output is 20,000, what is the average fixed cost? $|:|. (Enter a numeric response using a reai number rounded to two decimai places.) Assuming that the cost curves have the usual shape, the dollar difference between average total costs and average variable costs |:| as output increases. increases remains constant decreases