need the answer for all question (a-c)

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 responso to two decimal places). The activites that represent the projects crecal pah are A-C - E - H. I - K.M.N