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"Pretty much every department gets a cost center code, and each cost center code gets a budget," she explains. "When we do their work, we get their code, and we use that for the billing systems in each area."

"Our goal is to charge back 100 percent of our expenses," she adds.

Grega says that when the in-plant is working out the cost of a job, she makes sure it's a "fully loaded cost," which means that much more than labor and supplies are accounted for.