Figure $6\mathrm{.}11$ details the process flow for two types of customers who enter Barbara's Boutique shop for customized dress alterations. After Step T$1,$

Type A customers proceed to Step T$2$ and then to any of the three workstations at T$3,$ followed by Steps T$4$ and T$7.$ After

Step T$1,$ Type B customers proceed to Step T$5$ and then Steps T$6$ and T$7.$ The numbers in parentheses are the minutes it takes to process a customer.

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 T$1$ or T$7.$

$2\mathrm{.}21$ customers per hour

$6\mathrm{.}45$ customers per hour

$3\mathrm{.}33$ customers per hour

$5\mathrm{.}33$ customers per ho