How do you find density based on molarity and percentage

If a fairly concentrated hydrochloric acid solution is 9.80 M and 90.5%, what is the density of this solution?

Take a liter of solution. The weight of HCl is:

mass HCl = 9.8 mole HCl x 36.5 = 357.7 g
mass H2O = 905 g
total mass = 1260 g
density = 1260 g / 1000 mL = 1.26 g/mL