How much 6% developer should be mixed with 100 ml hair cream?

I want to know how much 6% developer should be mixed with 100 ml hair color

How much 6% developer should be mixed with 100 ml hair cream?
If your other post you say 60%, so which is it? In the other post I respond to the 60% because that is crazy- too much. But if it is only 6%- you can not get your lift with it. Once again, wrong developer choice. Follow you instructions as far as proportions. Some high lift colors want more than 50% developer.
Reply:In the United States, we mix our color in oz. It's 50-50. Also, I have never heard of 6%, only 0,5,10, 20, 30, 40 percent.