When 50.0 millimeters of 3.0 - molar NaHCO3 is added to 50.0 millimeters of 1.0-molar Na2CO3 the resulting concentration of NA+ is?

When 50.0 millimeters of 3.0 - molar NaHCO3 is added to 50.0 millimeters of 1.0-molar Na2CO3 the resulting concentration of NA+ is?
Update: I need to find millimeters or use empirical to find the concentration of NA+?
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