Table 918
a Company Desires to Set Up a Line to to Produce

Table 9.18
A company desires to set up a line to produce 60 units per hour.
The work elements and their precedence relationships are as follows.
$$\begin{array} { | c | c | c | } \begin{array} { c } \text { Work } \\\text { Element }\end{array} & \text { Time (sec) } & \begin{array} { c } \text { Immediate } \\\text { Predecessor(s) }\end{array} \\\hline 1 & 40 & - - \\2 & 30 & 1 \\3 & 50 & 1 \\4 & 40 & 2 \\5 & 6 & 2 \\6 & 25 & 3 \\7 & 15 & 3 \\8 & 20 & 4,5 \\9 & 18 & 6,7 \\10 & 30 & 8,9 \\\hline\end{array}$$
-Use the information in Table 9.18.Suppose that a solution has been found to this problem with five stations.What is its efficiency?

A) less than 93%
B) more than 93% but less than or equal to 95%
C) more than 95% but less than or equal to 97%
D) more than 97%