Calculate the concentrations of all ions after 50.0 mL of a 0.100 M AgNO3 solution is mixed with 100.0 mL of a 1.00 M Na2SO4 solution.For Ag2SO4 Ksp = 1.2 x 10-5

Do I first do MiVi=MfVf and then using the two concentrations I use ksp value?
I'm just so confused.