Continuing with the ice cream shop example, assume you are trying a different workstation configuration, as indicated below:

Workstation Tasks in Order Workstation Time $($sec$)$ Idle Time $($sec$)$

$1$ A$,$ B $604$

$2$ C$,$ D $604$

$3$ E $604$

$4$ F$,$ H $3529$

$5$ G $559$

What is the efficiency of this arrangement?

Express your answer as a percentage with up to two decimal places.