SOLVED PROBLEM $15\mathrm{.}4$

Use Johnson's rule to find the optimum sequence for processing the jobs shown through two work centers. Times at each center are in hours.

$\backslash$table$[[$JOB$,$WORK CENTER $1,$WORK CENTER $2],[$A$,6,12],[$B$,3,7],[$C$,18,9],[$D$,15,14],[$E$,16,8],[$F$,10,15]]$