A company has planned to set up a production line for the next month. In the production line, they produce three types of products, which are Product A$,$ B and C$.$ These products are processed in two departments: Assembly and Chemical Processes. All three products are produced from Stainless Steel and need Rustproofing.

Table $1$ displays the number of permanent workers employed across the two different departments. It is assumed that these workers have received training specifically for their respective departments. The salary for these workers is based on an hourly rate, as detailed in Table $1.$ Additionally, we should consider a standard month with $20$ working days, during which each worker is expected to work a maximum of $8$ hours per day.

Since the permanent workers are paid monthly, they need to be paid $8$ hours per day no matter whether they are working or not for their $8$ hours of the day. Thus, the sum of the regular labour costs for the months is fixed, regardless of the production in the month.