Before detailing about these methods there are 3 main elements of costs used within the methods, which are fixed, variable and semi variable costs. Fixed cost are costs that tend not to be affected by fluctuations in activity for example rent for the year of a premises, where as a variable cost varies in direct proportion to the level or volume of activity, so for instance the greater number of plastic toys produced, the greater the cost of plastic materials. Lastly a semi variable cost is a cost comprising of both fixed and variable parts and therefore is partly affected by changes in activity but not in direct proportion as variable costs are. These costs are important to distinguish as they are then classified from labour costs, materials and overheads as either direct or indirect costs(directly or indirectly related to the product) terms which will be mentioned when describing the two costing methods following. (Paraphrased definitions incorporated into above text
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