8. A single test operator staffs the SCM Corporation’s three testing machines in its quality control lab. Only one machine is run at a time. SCM uses two scheduling rules: one for sequencing jobs at individual machines and another for assigning labor to machines. As of 8 a.m. today (on day 10), jobs waiting to be processed at each of the three machines are as follows:

Job Due Date* Processing Time† Arrival Date*

Test Machine A 1 12 1 9 5 18 6 8 Test Machine B 2 14 3 6 3 16 4 7 6 14 6 6 Test Machine C 4 13 4 5

* = Day number.

† = In days.