An optometry store offers two different types of eye services, full$-$service and glasses$-$only. The full$-$service require$($s$)$ three steps: eye examination, glasses fitting and checkout. The glasses$-$only only require$($s$)$ two steps: glasses fitting and checkout. The eye examination step has a capacity of $3$ patients per hour. The glasses fitting step has a capacity of $7$ patients per hour. The checkout step has a capacity of $10$ patients per hour. The demand for full$-$service is $5$ patients per hour and the demand for glasses$-$only is $9$ patients per hour. what is the implied utilization