The figure below details the process flow for two types of customers who enter Barbara's Boutique shop for customized dress alterations. After step T1, Type A customers proceed to step T2 and then to any of the three workstations at T3, followed by steps T4 and T7. After step T1, Type B customers proceed to Step T5 and then steps T6 and T7. The numbers in parentheses are the minutes it takes to process a customer. a. What is the capacity of Barbara's shop in terms of the numbers of Type A customers who can be served in an hour? Assume no customers are waiting at steps T1 or T7. customers. (Enter your response rounded down to the next whole number.)