Gambarini 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 $197.80 per unit. Sales volume (units)... 6,000 7,000 Cost of sales. es............ $ 486,600 $ 567,700 Selling and administrative costs $ 612,600 $ 624,400 The best estimate of the total monthly fixed cost is: A. $1,145,650 B. $1,099,200 C. $1,192,100 D. $541,800