Five points isn't worth that much tbh, but I'll still help anyways :) that's what the site is for; no need to entice people into doing your problems -- we signed up because we're happy to help!
The graph should look like this:
Days: Cost:
0 120 4 140 (120+20 in admissions) 8 160 (120+40 in admissions) 12 180 (120+60 in admissions) 16 200 (120+80 in admissions)
