Look at the provided values in the below table, calculate the late start of activity C.

1212To calculate the late start of activity C, you must perform a forward pass and a backward pass. To calculate a backward pass: draw the network diagram and perform a forward pass. Then follow these steps:
1. Begin with the final activity. The late finish will be the same as the early finish date.
2. Subtract the duration of the activity from the end date and add 1 to calculate the late start. Take this number and subtract 1 to calculate the late finish of its predecessors.
3. Continue calculating the latest start and latest finish dates, moving backward through all the network paths.
4. When an activity has two connecting predecessors, the late finish date would be the late start minus 1 of the activity that follows. Figure 6.3 shows the network diagram with early start and early finish dates calculated.