Ladanza Corporation is a wholesaler that sells a single product. Management has provided the following cost data for two levels of monthly sales volume. The company sells the product for $195.70 per unit. Sales volume (units) 6000 7000 Cost of sales $457800 $534100 Selling and administrative costs $621000 $639100 The best estimate of the total contribution margin when 6,300 units are sold is: a $752,220 b $638,190 c $100,170 d $177,030 2. Property taxes and insurance premiums paid on a factory building are examples of manufacturing overhead. True False 3 Manufacturing overhead consists of: a all manufacturing costs. b indirect materials but not indirect labor. c all manufacturing costs, except direct materials and direct labor. d indirect labor but not indirect materials