The two things which allow us to calculate a project's cost estimate at completion are:
Forecasted spending for the remainder of the project.
Actual costs of the project to date.
Project cost estimating is done when any business predicts the overall cost of a project by outlining its scope of work accurately. Project cost estimation requires looking at the different tasks, resources and duration which are required to forecast a project's total cost to deliver.
The more closer is the estimate to the actual cost of a project, the more greater spending will stay in the green once the project gets started.
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