The J&B Company needs to produce $5500$ boxes of cakes per $55-$hour week to meet upcoming eid holiday demand. The process of making cake can be broken down into six work elemeniate ts$.$ The precedence and time requirements for each element are as follows. Draw and label a precedence diagram for the production process.

Set up a balanced assembly line and calculate the efficiency of the line.

$\backslash$table$[[\backslash$table$[[$WORK$],[$ELEMENT$]],$PRECEDENCE,$\backslash$table$[[$PERFORMANCE$],[$TIME $($MIN$)]]],[$A$,-,0\mathrm{.}10],[$B$,$A$,0\mathrm{.}40],[$C$,$A$,0\mathrm{.}50],[$D$,-,0\mathrm{.}20],[$E$,$C$,$ D$,0\mathrm{.}60],[$F$,$B$,$ E$,0\mathrm{.}40]]$