Question 12 (Mandatory) (4 points) EZS is a small fast food outlet serving mainly freshly prepared, customizable line of sandwiches. It is supplemented with an assortment of drinks, light salads, seasonal fruit and snacks. A customer joining the line makes a sandwich selection by consulting the billboard, and marks her selection on a customized form. She then hands the form to an assembler who produces the sandwich while she moves on. The customer does not wait for the sandwich to be assembled, but proceeds directly down the line to select additional items onto her tray. Next, the customer proceeds to pay at the cash register. Finally, (after the payment is completed) she collects her prepared sandwich at a designated location. A sample of 10 customers was taken at random, and the following time (in seconds) in process were recorded: 175, 165, 185, 205, 170, 210, 195, 225, 215, 235. Assume a theoretical flow time of 160 seconds. What is the process flow time efficiency? a) 96.96% b) 80.80% c) 75.75% d) 68.09%