Table 1021
the Following Information Is Given About an Assembly Line

Table 10.21
The following information is given about an assembly line.
The desired output rate is 90 units per hour
$$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Work } \\\text { Element }\end{array} & \text { Time } ( \mathrm { sec } ) & \begin{array} { c } \text { Immediate } \\\text { Predecessor(s) }\end{array} \\\hline \text { A } & 10 & - - \\\text { B } & 6 & \text { A } \\\text { C } & 15 & \text { A } \\\text { D } & 20 & \text { B } \\\text { E } & 12 & \text { B } \\\text { F } & 14 & \text { C, E } \\\text { G } & 8 & \text { D } \\\text { H } & 20 & \text { F, G } \\\hline\end{array}$$
-Use the information in Table 10.21. Suppose that the desired output rate is increased to 120 units per hour and a solution has been found that has 4 workstations. What is the efficiency of this new assembly line?

A) less than 80%
B) between 80% and 85%
C) between 85% and 90%
D) more than 90%