Buying back Military time retirement?

I did elven years in the Army and I am now a GS employee with have the Federal Employee Retirement System (FERS). I am checking into buying back my time for retirement. Anybody here ever done this of know how they charge? I have gotten the statement back that says how much I have earned form base pay and have... show more I did elven years in the Army and I am now a GS employee with have the Federal Employee Retirement System (FERS). I am checking into buying back my time for retirement. Anybody here ever done this of know how they charge? I have gotten the statement back that says how much I have earned form base pay and have sent it out.

Just curious to know if anybody knows how they figure it or has ever been through it.
Update: Thanks, I am/was CHEM. I am a DA employee still doing CHEM
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