$9.($Chapter $3$: Process Analysis$)$ An assembly process requires the completion of six

activities. A$1$ takes $3$ minutes$/$unit$,$ A$22$ minutes$/$unit$,$ A$36$ minutes$/$unit$,$ A$41$ minute$/$unit$,$ A$5$

$2$ minutes$/$unit$,$ A$61$ minute$/$unit$.$ Right now, the six tasks are assigned to three workers as

follows. The first worker takes activities A$1$ and A$2,$ the second worker takes activities A$3$ and

A$4,$ and the third worker takes activities A$5$ to A$6.$ Approximately how much can you improve

the process capacity by assigning A$4$ to the third worker?