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Excavation – $250,000
Subgrade – $150,000
Base course – $400,000
Concrete pavement – $600,000

Assuming that the field supervision costs is 10% of the basic cost, and the office overhead is 5% of the direct costs (basic costs + field supervision cost), find the prorated field supervision costs, general office overhead costs and the total costs for the various elements of the project.

I dont even know where to begin..an suggestions or help?

thanks in advance
help me please