Coleman Rich Control Devices, Inc., produces custom$-$built relay devices for auto makers. The most recent project

undertaken by Rich requires $14$ different activities. Rich's managers would like to determine the total project completion

time $($in days$)$ and those activities that lie along the critical path. The appropriate data are shown in the following table:

a$)$ The expected completion time of the project $=$

days $($round your response to two decimal places$).$ ONLY ANSWER IF SURE, THE AI ANSWER OF $50\mathrm{.}69$ IS NOT CORRECT