All but the last station of a $6-$station rotary$-$indexing machine perform machining operations and the last station is used for unloading and loading parts. The longest process time is $3\mathrm{.}7$min and the loading$/$unloading time is less than this. It takes $6\mathrm{.}5$ sec$.$ to index the machine between workstations. Stations break down with a frequency of $0\mathrm{.}017,$ which is considered equal for all stations. When breakdowns occur, it takes an average of $6\mathrm{.}2$ min to diagnose the problem and make repairs. Determine the line efficiency $($percent$,2$ decimal points, e$.$g$.,84\mathrm{.}32)85\mathrm{.}7591$ margin of error $+/-1\%$