(n-r+1) * 100 + switch(r, 1, 1000, 2, 600, 3, 300)
Note that this formula changes with the number of entrants. First place in a tournament of 20 people will receive 3000 points (2000 + the bonus 1000), but first place in a tournament of 50 people will receive 6000 points (5000 + the bonus 1000).