please provide answer for B,C,D,E,F,G,H, (LS - EF)

Charlie Cook was able to determine the activity times for constructing his chemical contaminant tracking machine. Cook would like to determine ES, EF, LS, LF, and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity times: Charlie's earliest start (ES) and earliest finish (EF) are