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Problem $12-3($LO $12-2)$ Sequence the jobs shown below...

Sequence the jobs shown below by using a Gantt chart. Assume that the move time between machines is one hour. Sequence the jobs in priority order $1,2,3,4.$

Job Work Center$/$Machine Hours Due Date $($days$)$

$1$ A$/3,$ B$/2,$ C$/23$

$2$ C$/2,$ A$/42$

$3$ B$/6,$ A$/1,$ C$/34$

$4$ C$/4,$ A$/1,$ B$/23$

a$.$ What is the makespan?

b$.$ How much machine idle time is there?

c$.$ When is each job delivered compared with its due date?

d$.$ How much idle time $($waiting time$)$ is there for each job?

e$.$ Devise a better job sequence for processing.

Sequence Job

$1$ multiple choice $1$

$1$

$2$

$3$ Correct

$4$

$2$ multiple choice $2$

$1$

$2$ Correct

$3$

$4$

$3$ multiple choice $3$

$1$

$2$

$3$

$4$ Correct

$4$ multiple choice $4$

$1$ Correct

$2$

$3$

$4$