Need help with b( have already completed first come, first serve) and C. Thanks!

Question 1: the following table contains information concerning four jobs that are awaiting processing at a work center. a. Sequence the jobs using (1) First come, first served, (2) Shortest processing time, (3) Earliest due date, and (4) Critical ratio. Assume the list is by order of arrival. Critical ratio: For Job A: CR=(150)/72.14 For Job B: CR=(210)/15=1.40 For Job C: CR =(170)/6=2.83 For Job D: CR=(160)/10=1.60 b. For each of the methods in part a, determine (1) the average job flow time, (2) the average tardiness, and (3) the average number of jobs at the work center. FCFS: c. Is one method superior to the others