A company reports the following information about its unit sales and its cost of sales. Each unit sells for $500. Use these data to prepare a scatter diagram. Draw an estimated line of cost behavior and determine whether the cost appears to be variable, fixed, or mixed. Period Unit Sales Cost of Sales Period Unit Sales Cost of Sales 1 22,500 $15,150 11,250 $ 8.250 2 17.250 11,250 5 13.500 9,000 3 15,750 10,500 6 18.750 14,250 4