EXERCSE 2yFixed and Variable Costs ILOSI Urban Auto Glass specializes in the repair and replacement of windshields for passenger vehicles. Variable and fixed costs related to installation activities for the most recent month July) are listed below: Item Number of windshelds installed Variable expenses 1000 Direct materials. Direct labour (1hour per installation). Indirect materials ...$200000 30000 Fived expenses nstallation supervisor's wages Installation scheduler's wages $4000 2000 ..5000 Required 1. Calculate the per unit amounts for each of the variable expense and fixed expense items 2 in Juhe the 2. Management expects that 1200 windshields will be installed in August and that this level in July of activity is within the relevant range for all variable and fixed expenses. Calculate a. The total expense for each of the variable and fixed cost items above. The per unit amounts for each of the variable and fixed cost items above. Explain any differences in the per unit amounts between July and August. some factors that might cause variable costs per unit to change if the actual level of activity in a given month falls above or below the relevant range