Mach $10$ is a one$-$person sailboat designed to be used in the ocean. Manufactured by Creative Leisure, Mach $10$ can handle $40-$mph vinds and seas over $10$ feet. The final assembly plant is in Cupertino, California. At this time, $300$ minutes are available each day to nanufacture Mach $10.$ The daily demand is $58$ boats. Given the following information:

$\backslash$table$[[$Task$,\backslash$table$[[$Performance$],[$Time $($mins$)]],$Predecessors$],[$A$,1,-],[$B$,1,$A$],[$C$,3,$A$],[$D$,1,$C$],[$E$,3,$C$],[$F$,1,$C$],[$G$,1,$D$,$ E$,$ F$],[$H$,2,$B$],[$I$,1,$G$,$ H$]]$

a$)$ The correct precedence relationship with one of the possible assignment of tasks to workstations is shown in Fig $3.$

The operating efficiency of the assembly line with $3$ workstations shown in the figure chosen above $=\%($enter your response as a percentage rounded to one decimal place$).$