Table 9.17
The Pennsylvania Appliance company is installing an assembly line to produce vacuum cleaners, and you, as an operations manager, are responsible for balancing the line. The work elements to be performed are listed, along with their items and immediate predecessors.

\begin{array} { | c | c | c | } \begin{array} { c } \text { Work } \\\text { Element }\end{array} & \text { Time (sec) } & \begin{array} { c } \text { Immediate } \\\text { Predecessor(s) }\end{array} \\\hline \mathrm { A } & 60 & - - \\\mathrm { B } & 40 & \mathrm {~A} \\\mathrm { C } & 30 & \mathrm {~B} \\\mathrm { D } & 20 & \mathrm {~B} \\\mathrm { E } & 40 & \mathrm {~B} \\\mathrm {~F} & 60 & \mathrm { C } \\\mathrm { G } & 70 & \mathrm { D } \\\mathrm { H } & 50 & \mathrm {~F} , \mathrm { G } \\\mathrm { I } & 20 & \mathrm { E } \\\mathrm { J } & 60 & \mathrm { H } , \mathrm { I } \\\hline\end{array}

-Use the information in Table 9.17.What is the efficiency of the longest work-element time solution just found?
A) less than 91%
B) more than 91% and less than 93%
C) more than 93% and less than 95%
D) more than 95%

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