A shoe repair operation uses a two$-$step sequence that all jobs in a certain category follow. All jobs can be split in half at both stations. For the group of jobs listed:

$\backslash$table$[[,$J$0$B TIMES $($minutes$)],[,$A$,$B$,$C$,$D$,$E$],[$Workstation A$,27,18,76,26,15],[$Warkstation B$,45,33,36,24,10]]$

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a$.$ Find the sequence that will minimize total completion time.

The sequence is

b$.$ Determine the amount of idle time for workstation $B.$

Idle time

minutes