Ok - when you first start out it pays to think about what you are trying to find out - if you have 3.02 x 10^{4} cells per ml and 10 ml of that suspension then you have 3.02 x10^{5 }cells total (n = c x v, n=3.02x10^{4} cells/ml x 10 ml)...

Now as you can see this isn't enough to get 10^{6 }cells at all... so you need to grow more cells.

However the working for your formula, if you insisted on using it, would be C1=3.02 x 10^{4} V1= ? C2=10^{6} V2=1 (note you don't want 10^{6 }cells/ml and 8 ml of it, you want 10^{6} total).

V1= (10^{6} x 1)/3.02x10^{4}

V1= 33.11 ml

V1 is the variable you want to know as it is the amount you need to take from your initial cell suspension to get the concentration and volume you need at the end. The amount of cells you have initially is irrelevant (unless you don't have enough). I would usually get people to calculate the total amount of cells the have first (n=c x v) - so that they know the have enough to go on with, then they can calculate further the amount required to get the concentration they need either using C1V1 or v= n/c depending on how they have done the harvest.