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 windshields installed 1,800 Variable expenses: Direct materials Direct labour (1 hour per installation) Indirect materials $ 370,800 48,600 25,200 Fixed expenses: Installation supervisor's wages Installation scheduler's wages Warehouse expenses $ 16,200 12,600 18,000 Required: 1. Calculate the per unit amounts for each of the variable expense and fixed expense items in July Item Per Unit Variable expenses Direct materials Direct labour (1 hour per installation) Indirect materials Fixed expenses: Installation supervisor's wages Installation scheduler's wages Warehouse expenses