Gircle Inc. has only two retail and two wholesale customers. Information relating to each customer for 2020 follows (Click the icon to view the data) Requirement Calculate customer-level operating income. Begin by calculating each customer's gross margin. Then calculate the operating income for each customer. (Use parentheses or a minus sign to enter a neg customer, oper: = operating ) d two wholesale customers. Information relating to each customer for 2020 follows: tata. ating income. Data table e gross margin or a