A manufacturing co. operates a shop that includes 20 M/C s. Due to the type of work performed in the shop , they require frequent repair. The co. has one senior repair person with an assistant. They repair the M/C s in the same order as they break down. M/c break down are according to Poisson and service is exponential. Each M/c operates an average of 200 hours before breaking down. The average time to repair a M/c is 3.6 Hours. The co. would like an analysis of M/c idle time due to break downs to determine if the present repair staff is sufficient