Please post step-by-step procedure of how you got the answer

Chap. 8, question 2

2. The production manager at the Knox Machine Company is preparing a production schedule for one of the fabrication shop's machines, the P\&W grinder. He has collected the following information on jobs currently waiting to be processed at this machine. (There are no other jobs, and the machine is empty.) -Note: This is the final operation for cach of these jobs. a. The production manager has heard about three dispatching rules: the shortest operation next rule, the first-come/first-served rule, and the earliest due date rule. In what sequence would these jobs be processed at the P\&W grinder if each rule were applied? b. If it's now the moming of July 10 and the shortest operation next rule is used, when would cach of the four jobs start and be completed on the P \&W grinder? (Express your schedule in terms of the calendar dates involved, assuming that there are seven working days each week.)