Studies of a bank of four weaving machines at the Loose Knit textile mill have shown that, on average, each machine needs adjusting every hour and that the current servicer averages 7 minutes per adjust- ment. Assuming Poisson arrivals, exponential service, and a machine idle time cost of $40 per hour, determine if a second servicer (who also averages 7 minutes per adjustment) should be hired at a rate of $7 per hour.