Product P is made in-house by assembling two parts (parts 1 and 2): Part 1 is first processed on machine A for 15 minutes per unit and then processed...

Product P is made in-house by assembling two parts (parts 1 and 2): Part 1 is first processed on machine A for 15 minutes per unit and then processed on Machine B for 10 minutes per unit.  Part 2 is processed on machine C for 20 minutes per unit.  An assembler then assembles the two parts, with the assembly operation taking 15 minutes.a.