A production manager must determine the processing sequence for seven jobs through the grinding and de$-$burring departments. The same sequence will be followed in each department. The manager$$s goal is to move the jobs through the two departments as quickly as possible. The site supervisor of the grinding department wants the SPT rule to be used to minimize the work$-$in$-$process inventory in the department.

What is the total flow time in the grinding department for the SPT sequence?