Instant Dolls specialises in manufacturing dolls. Their business process consists of the following activities, which must be conducted in the sequence described below $($The time required for each activity is shown in parenthesis$)$:

Activity $1$: Get the specifications of the doll from the customer, get the payment and submit the order to the production line. $(6$ minutes$)$

Activity $2$: Assemble the main body of the doll. $(12$ minutes$)$

Activity $3$: Add hair and paint. $(12$ minutes$)$

Activity $4$: Dress the doll. $(3$ minutes$)$

Activity $5$: Package the doll. $(7$ minutes$)$

The whole process is conducted by three workers. The assignment of tasks to workers is the following:

Worker $1$ does Activity $1$;

Worker $2$ does Activities $2$ and $3$;

Worker $3$ does Activities $4$ and $5.$

What is the utilisation rate of Worker $3?$ Express your answer as a $\%$ to $2$ decimal places.

NOTE: there are no buffers between the stations.