PS$\mathrm{.}74$ Bell computer is planning to launch a new high$-$end server. Nine steps or tasks are required to assemble this computer. Daily demand is expected to be $85$ units and there are three $8-$hour shifts available each day to meet this production quota.

Task Req'd Time $($in minutes$)$ Predecessor

A $12$ None

B $12$ A

C $5$ B

D $4$ B

E $13$ A

F $3$ C$,$ D

G $7$ F

H $13$ E

I $4$ G$,$ H

What is the total time $($in minutes$)$ to produce one server?

$73$