$\backslash$table$[[$Task$,$Immediate predecessor,Task time $($min$)],[$A$,-,12],[$B$,$A$,6],[$C$,$B$,6],[$D$,$B$,2],[$E$,$B$,2],[$F$,$B$,12],[$G$,$C$,$ D$,7],[$H$,$G$,5],[$I$,$E$,1],[$J$,$F$,$ I,$4],[$K$,$H$,$ J$,6],[$L$,$K$,7]]$

Demand rate $=140$ units$/$week

Assembly operates for $1$ shift$/$day $(7$ hours$),5$ days a week.

i$.$ Draw a precedence diagram,

ii$.$ Design an assembly line,

iii. Find line efficiency