You take 0.050 L of a 0.500 M solution of NH3 and you dilute…

You take 0.050 L of a 0.500 M solution of NH3 and you dilute it until the final volume of the solution is 0.250 L. What is the new concentration? Remember, M1 V1 = M2 V2 where M1 is the initial concentration, M2 is the final concentration and V1 and V2 are the initial and final volumes respectively.