Calculate difference in volume...?

a solution i sprepared by mixing 600 mLs of methanol and 500 mLs of water the molarity of methanol is 14.0 M. The density of the methanol at this temperature is .0.8 g/mL. Calculate the difference in the volume between this solution and the total volume of water and methanol that were mixed to prepare the solution. PLEASE HELP! im so confused