u/Far_Break_253

I want to open a 529 for my 3yr old and have about $20k to put into it. Can anyone tell me what I should expect that to have after 15 years without any additional contributions (once he turns 18 and goes to college)? Can you also tell me what that amount would be if I added $100/month for all 15 years? I want to get as much info as possible before I reach out to an advisor. Thank you very much.