Suppose the total cost of producing 15 comma 00015,000 tennis balls is $50 comma 00050,000, and the fixed cost is $20 comma 00020,000. Part 2 The variable cost is $enter your response here. (Enter your response as a whole number.) Part 3 When output is 15 comma 00015,000, the average variable cost is $enter your response here. (Enter your response rounded to two decimal places.) Part 4 When output is 15 comma 00015,000, the average fixed cost is $enter your response here. (Enter your response rounded to two decimal places.) Part 5 Assuming that the cost curves have the usual shape, the dollar difference between average total cost and average variable cost ▼ increases remains constant decreases as output increases.