Fixed and variable cost

Fixed Costs: These are those costs which remain fixed up to certain range of work capacity no matter how much product you produce within that capacity range. Like factory building rent. You pay the rent no matter that did you use that building for making the products or not.

Variable Costs: These are those costs which change with the change in the number of product units you produce. Like Material , Labor etc

Mixed Cost/Semi Variable Costs: These are those cost the part of which is remain fixed and some part of the cost is variable.

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Difference between fixed and variable cost

Costs can be classified into two categories, fixed and variable costs. These costs behave differently based on the level of sales volumes. Suppose we are running a restaurant and have identified certain costs along with the number of annual units sold of 1000.

Item: Raw Materials (cost for hamburgers)
Total Annual Cost: 650
Item: Building Rent
Total Annual Cost: 9000
Identify which cost item above is fixed and variable and why? What is the cost per unit of each? Suppose we increased our sales volume to 6000 units and then to 8000 units the following year (and are still within the relevant range), what would be the total annual cost and unit cost of fixed and variable costs?