TEAMWORK IN ACTION Retail store that sells music CDs 1. In retail store that sell music CDs, the single measure best reflects the overall level of activity is Number of CDs sold. - In respect to changes in the measure of CDs sold, a variable cost is a cost that varies, in total, in direct proportion while a fixed cost remains unchanged, in total, regardless of any change. ->Examples of fixed and variable costs in respect to small changes in the measure of selling CDs: Cost| Cost behavior| | Variable| Fixed| The cost of advertising new store| | X|

Number of CDs supplied| X| | The cost of renting space for store| | X| The electrical cost in store| | X| The direct labor cost| | X| The cost of delivering CDs | X| | Variable Cost Number of CDs supplied| Cost of CD| Total variable Cost – CDs| 1| 35. 000| 35. 000| 50| 35. 000| 1. 750. 000| 100| 35. 000| 3. 500. 000| Fixed Cost Monthly Labor cost| Number of CDs sold| Average cost per CD| 5. 000. 000| 20| 250. 000| 5. 000. 000| 70| 71. 428,6| 5. 000. 000| 150| 33. 333,3| 2. Relationship between the number of CDs sold and others: Cost| Behavior of the cost| In Total| Per Unit| Fixed cost| Total fixed cost is not affected by changed in the number of CDs sold. | Fixed cost per unit decreases as the number of CDs sold rises and increases as this number falls. | Variable cost| Total variable cost increases and decreases in proportion to changes in the number of CDs sold. | Variable cost per unit remains constant. | | | | Total cost| Increases and decreases in proportion to changes in the number of CDs sold| Average total cost per unit| Increases and decreases in proportion to changes in the number of CDs sold|