$2)$ At a certain grocery store, the customers are unwilling to wait more than $10$ minutes in a line. Once a line gets this long, customers leave their items on the floor or new customers won$$t even bother coming in$.$ In both cases, the grocery store losses revenue and they estimate the cost of waiting to be about $$5\mathrm{.}00$ per waiting customer. Assume that a cashier costs $$15\mathrm{.}00/$hr and can handle $9$ customers per hour. Fill in the table below to help answer the questions.