SAT tutor — how much should I charge?

Hi and welcome to my blog,
I opened this blog to help anyone who is preparing for his SAT.
I remember myself when I started - I was so lost and in such a panic.
Luckily I got this great SAT guide that helped me a lot . So study hard and good luck!
I am 18 and a high school senior who will be graduating in a few days. I took my SAT only once and scored 2230, with scores of over 700 on each section. Additionally, I got perfect scores on the math and writing sections of my PSAT. I have a 4.6 GPA and have been told that I would make a great teacher, though I have never done any formal tutoring aside from volunteering to tutor a kid in Spanish a couple times after school.
While discussing the SAT, a junior I know who wanted to raise her score above 2100 (currently at 2070) asked me if I would tutor her, and her parents would pay if I could guarantee she’d score over 2100 (which I feel pretty confident I could do).
How much should I charge per hour?
Thank you!!
SAT prep costs a lot of money. It’s not unusual for a parent to pay well over a grand for an SAT prep class. A private tutor will normally charge between $20 or $30 an hour for prep. Since you’re just starting out and haven’t had any experience, you might want to charge a little less. Most people around your age I know who tutor charge $20 per hour. If she gets good results or her next test, you can parlay that into a higher fee.
Good luck! While I scored 2300 on my SAT (my 4th time since I took it back in elementary and middle school for fun) I never put in more than maybe 2 hours of studying. I would have no idea how to help someone and I think my aunt wants me to tutor my cousin. Woe is me! Haha.