Use Johnson's Rule to determine the optimum processing sequence for the jobs listed below.
1. Determine the optimum process sequence
2. What time is Job B completed on Work Centre 1?
3. What time is Job B completed on Work Centre 2?
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Processing Time (minutes)
Job 
Centre 1 
Centre 2 
A 
20 
12 
B 
10 
32 
C 
8 
9 
D 
14 
7 
E 
5 
6 
F 
18 
6 
Optimum Sequence – Work Centre #1






Optimum Sequence – Work Centre #2






Work Centre #1  Work Centre #2  
Job B completed (Minutes) 
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\begin{array}{l}\text { A } 20 \quad 12 \\B7032 \\{ }^{}89 \\D147 \\E56 \\\cdots F186 \\\end{array}\text { A } \Rightarrow \text { E } C D Euning Johnsor's rule, correw sequence isE C B A D F ...