What is the % by volume of ethanol of a solution made by adding 50 g of ethanol with 50 g of H2O?

At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a density of 1.0 g/ml. What is the % by volume of ethanol of a solution made by adding 50 g of ethanol with 50 g of H2O?