Work it out yourself, it's not hard...
From 30000 exp (Level 38) you will need to make 110,304 Prayer pots.
Clean Ranarr unf costs 3222, Snape Grass costs 202, 3222+202= 3424gp per potion
They sell for 2489 (3 dose)
3424-2489= 935
935*110,304 = 103,134,240
You're lucky I put the effort in to do that