Which formula can you use toenter a value for Profit and have the system re-calculate Cost while Revenue remains constant?

Your account dimension has an account for Profit that is calculated as [Revenue] – [Cost].

Which formula can you use toenter a value for Profit and have the system re-calculate Cost while Revenue remains constant?
A . [Revenue] – [Cost] | INVERSE ([Cost] = [Revenue] -[Profit])
B. [Revenue] – [Cost] := INVERSE ([Cost] = [Revenue] -[Profit])
C. [Revenue] – [Cost] | INVERSE ([Cost] := [Revenue] -[Profit])
D. [Revenue] – [Cost] := (INVERSE [Cost] := [Revenue] -[Profit])

Answer: C