4. Dougs Doughnuts and Gourmet Coffee is considering a new store location. For accounting purposes, fixed annual operating costs for a store are $115,800 a year, and variable costs are 26 percent of sales and taxes are 22% of pretax income. The average sale for each customer is a doughnut and coffee which cost the customer $5.52. The annual net income break-even level of sales (in number of customers) for this store location is _______.