Assume the system below used different random numbers, from the example we studied in class, for the inter$-$arrival and ATM processing times. The events at $12\mathrm{.}7$ and $15\mathrm{.}2$ are the last two events we processed in our simulation. Based on the simulation chart below. What will be the total customer minutes $($X$1)$ at $15\mathrm{.}2$ simulation time? $($i$.$e$.$ the system time for all customers, including the customers still in the system and the customers who left the system already$).$ All times are in minutes. Respond with only a numerical value with a single decimal digit. $($i$.$e$.$ no need to write minutes$).$