what is the total amount of customer-driven costs that need to be allocated between retail and individual customers?

Stinler Corporation manufactures curtains for retail stores and for individual customers. The retail chain buys 70% of the curtains produced. The individual customers purchase curtains in approximately equal quantities, where the orders are about the same size. Data concerning Stinler's customer activity are as follows: Individual Retail Stores Customers Units sold 56,000 24,000 Orders placed 492 Number of sales calls 156 Manufacturing costs 8,000,000 3,500,000 Order filling costs allocated 375,000 225,000 Sales force costs allocated 265,000 135,000 Currently, allocations of Order Filling and Sales Force costs are assigned to customers based on units sold, a unit-level driver