PROBLEM 8-Fixed-variable Cost Analysis (28 points) The following costs and expenses have been taken from income statements of the Firett Company at a representative high and low level of activity. Sales Volume of $20,000 Sales Volume of $50,000 $30,000 2,000 190 $12,000 2,000 100 50 50 400 520 200 350 Materials.. Administrative Salaries Office Supplies.. Insurance... Delivery Expenses... Selling Expenses. REQUIRED: Using the High Low Points method, compute the cost structure of each expense item in terms of the fixed and variable portions.