A Rough Cost Estimate is an initial estimate that uses prior experience and other non-project data to estimate the cost of a project. It is also called a Rough Order of Magnitude (ROM) estimate, or a Conceptual Estimate. The Rough Cost Estimate is used for project screening, or deciding which among several projects to proceed with.
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it is a method of estimation used in school e.g 698,656,675,689=700,700,700,700next step is to multiply 700 X 4=2800
4
It is 36000.
It is 600.
It is front-end estimation.