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SB Mr$.$ K$$s is a very popular hair salon. $...$

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Mr$.$ K$$s is a very popular hair salon. It offers high$-$quality hair$-$styling and physical relaxation services at a reasonable price, so its services are always in demand. The service process includes five activities that are conducted in the sequence described below. $($The time required for each activity is shown in parentheses.$)$

Activity $1$: Welcome a guest and offer homemade herbal tea. $(10$ minutes$)$

Activity $2$: Wash and condition hair. $(10$ minutes$)$

Activity $3$: Neck, shoulder, and back stress release massage. $(10$ minutes$)$

Activity $4$: Design the hairstyle and do the hair. $(25$ minutes$)$

Activity $5$: Check out the guest. $(5$ minutes$)$

Three servers $($S$1,$ S$2,$ and S$3)$ offer the services in a worker$-$paced line. The assignment of tasks to servers is the following:

S$1$ does activity $1.$

S$2$ does activities $2$ and $3.$

S$3$ does activities $4$ and $5.$

TB Qu $04-58$ What is the utilization of$...$

What is the utilization of server $2?$

Note: Round the answer to one decimal place.