The following table shows orders to be processed at a machine. LO$3$

Job

Processing

Time $($days$)$

Due Date

$($days$)$

a$.$ Determine the processing sequence using each of these priority rules:

$(1)$ CR$,(2)$ MST$,(3)$ SPT$,(4)$ EDD.

b$.$ Determine the performance of each rule using $(1)$ average flow time,

$(2)$ average days late.

c$.$ Is one rule superior to the others?

A $820$

B $1018$

C $525$

D $1117$

E $935$