A company makes three products (X, Y and Z) using three machines (A, B and C). Each unit of X that is produced requires 120 minutes processing time on machine A and 240 minutes processing time on machine B and 60 minutes processing time on machine C. Each unit of Y that is produced requires 60 minutes processing time on machine A and 300 minutes processing time on machine B and 120 minutes processing time on machine C. Each unit of Z that is produced requires 180 minutes processing time on machine A and 180 minutes processing time on machine B and 60 minutes processing time on machine C. Available processing time on machine