A shop specializes in heat-treating gears. At 8 a.m., when the shop opened today, five orders were waiting to be processed. Assume that only one unit at a time can be heat-treated.

a. If the earliest due date (EDD) rule is used, what sequence should be used?
b. What will be the average minutes late for the sequence in part a?
c. What will be the average WIP in the system for the sequence in part a?
d. Would the SPT rule produce better results in terms of average minutes late?