How much do I charge?

Hi everyone, I am a current marketing student with one semester left. I currently have one client (6 or so months), and am getting ready to onboard another, just need to finalise the proposal.

I was wondering, for my experience, how much do I charge for a project I estimate will take 20-25 hours spread across 3 weeks? I’m not doing an hourly rate, i’m doing a fixed fee, project based. I was thinking $1,500 AUD GST Tax. This includes my usual hourly rate profit. This could be considered extremely high or even low, I’m still new so any advice would help!

I also aim to provide ongoing support once this project is completed.

If anyone could provide thoughts that would be amazing 😃