EAC = AC + (BAC - EV):

Sure, I can explain this formula step by step. This formula is used in project management for earned value analysis.

1. EAC stands for Estimate at Completion. It is the total cost expected at the completion of the project.

2. AC stands for Actual Cost. It is the cost that has been spent on the project till now.

3. BAC stands for Budget at Completion. It is the total budget that was estimated for the project at the start.

4. EV stands for Earned Value. It is the value of the work that has been completed till now.

So, the formula EAC = AC + (BAC - EV) is used to estimate the expected total cost of the project at completion. It is calculated by adding the actual cost till now (AC) and the difference between the initial budget (BAC) and the value of work done till now (EV).