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