The Late Finish (LF) for an activity in CPM is determined by adding the activity’s duration to its Late Start (LS).
For Activity 9004, if its Late Start is known, adding the activity’s 72-day duration gives the Late Finish date.
References: PSP Study Guide, Section 2.2.4 – Relationships and Calculations, highlights the importance of forward and backward pass calculations to determine ES, EF, LS, and LF.
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