H2O2 Math question

Hello,
I have a math question about H2O2 I need answered please. OK, people always asking how much H2O2 per gallon, Plants roots can easily handle an H2O2 concentration of up to 5%.
Thats out of the way, now for my question, If I'm using 29% food grade H2O2,how much per gallon do i add to the water so that I have a 5% H2O2 mixture?
Thank You in advance to anyone who is able to answer this for me

there are 3785 ml in a gallon. 5% of that would be 189.25 ml. if you added h202 to your solution at this rate you are going to stunt your root system in a serious way in my opinion. i use 15ml of 35% per 5 gallons with great success. peace...