A Manufacturer Needs to Produce 300 Coffee Pots Per 8

A manufacturer needs to produce 300 coffee pots per 8 hour day. The discrete tasks required to produce a coffee pot have been identified, timed in seconds, and ordered as indicated in the table. Sketch the precedence diagram and then assign tasks to workstations on the production line to achieve the required level of output. Break ties by assigning the longest task first. Determine the efficiency delay of your line balance.
$$\begin{array} { | c | c | c | } \hline \text { Task } & \text { Time } & \text { Predecessors } \\\hline \mathrm { A } & 80 & \cdots \\\hline \mathrm { B } & 25 & \mathrm {~A} \\\hline \mathrm { C } & 35 & \mathrm {~A} \\\hline \mathrm { D } & 20 & \mathrm {~B} , \mathrm { C } \\\hline \mathrm { E } & 50 & \mathrm { C } \\\hline \mathrm { F } & 70 & \mathrm { E } \\\hline \mathrm { G } & 45 & \mathrm { D } \\\hline \mathrm { H } & 25 & \mathrm { G } \\\hline \mathrm { I } & 15 & \mathrm { G } \\\hline \mathrm { J } & 40 & \mathrm {~F} , \mathrm { H } , \mathrm { I } \\\hline\end{array}$$