please answer 9,10,11,12 and 13. please show work

9. At a sales volume of 25 units the average cost is $200 per unit and the variable cost is $6 per unit. Assuming a linear cost behavior pattern, if sales double to 50 units the average cost will be: 10. Fanning Company had the following costs for the past three years in which it produced 40,000,48,000, and 60,000 units, respectively. 11. The total monthly operating costs of Juliana's Yogurt Ice Cream Shack (Y) is given by equation, Y=$3,800+$0.70X, where X= per serving. What is the average cost per serving at a monthly volume of 1,000 ? 12. The total monthly operating oosts of Juliana's Yogurt Ice Cream Shack (Y) is given by equation, Y=$3,800+$0.76X, where X= per serving. What is the monthly volume at which the average cost per serving is $2.70 ? 13. Assume the total monthly operating costs of a McDonald's restaurant are: $40,000+ $0.75X, where X= Number of salad orders. What is the average cost per salad at the monthly volume of 5,000 ? 14. Assume the total monthly operating costs of a McDonald's restaurant are: $40,000+ $0.75X, where X= Number of salad orders. What is the monthly volume at which the average cost per serving is $325