Converting an Existing DWG from meters to feet

I have been sent a DWG floor plan from a firm in South America. The existing file is Type: Decimal  and Units to scale: Meters. We need to convert the file to a useable architectural and feet set up. I know that I will need to scale the existing dwg however I am not sure what the exact steps are or what I should scale it by. Should I cahnge the drawing units first and then scale? Or the other way around? Biggest thing I need is the scale factor.

Thank you.

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