=+12. Following on from Question 11, modify model MC2 so that the machining time in the two-machine model is now exponentially distributed, then experiment with the model to find the machine capacity (Le. mean machining time) to achieve:

(a) mean machine utilization around 90% between the two machines

(b) mean WIP level of around 20 items

(c) mean throughput time of around 1.5 minutes.