9%.. lol you would be ripped as fuck and is pretty hard to achieve, 20% is healthy enough.
Now I happen to work in a fitness gym

and have also been dealing with being too heavy for a long time.
ATM I came down from 110kg/242lbs to currently 90kg/198lbs and got about 5kg/11lbs to go.
Losing weight is exact science, it isn't difficult but it requires a certain discipline.
Now what you don't do is eating too little, your body will put you in starvation mode and your metabolism will be very slow and everything will be absorbed.
It's sounds like a contradiction but to lose weight you need to eat more times over the day so you will keep that engine running.
So yeah exact science so you first need to calculate your maintenance, which means what does your body need at least to function normal over the day.
Globally for men this is 2500 calories but due to size, length etc it's slightly off, once you know your maintenance you will need to create a deficit and go let's say about 1k calories under it.
Of course cut junkfood, alcohol (that did it for me), artificial sugary food and drinks and eat brown products (brown rice, brown pasta) veggies, lean meat (chicken breast, turkey etc) as snacks use nuts, fruit and drink a shitload of water and green tea.
Last but not least at least workout 3 times a week, more is better. This can be strength training, traditional cardio (running, cycling etc), HIIT (programs like insanity) or something like MMA, I do a combo of all but as long as you do it at least 3 days a week you will be good.
Also make sure you sleep enough which is currently slowing down my progress as I am working this game 20/7.
Eat about every 2,5 hours and a total of 5-6 times, never skip breakfast and keep an eye on your calorie intake.
If it's too hard to cut the bad stuff in the beginning, set a junkday once in the week where you can eat bad stuff as a reward for your hard work.
You can calculate globally how many calories you need to eat to lose weight https://www.bodybuilding.com/fun/macronutcal.htm
You got this.