Product Layout $($LO $7\mathrm{.}6)$

The Basic Block Company needs to produce $4000$ boxes of blocks per $40-$hour week to meet upcoming holiday demand. The

process of making blocks can be broken down into six work elements. The chart below shows the precedence and time

requirements for each element. Draw and label a precedence diagram for the production process. Set up a balanced assembly line

and calculate the efficiency of the line.