You can't select 2 hitmen currently, but you will be able to in the next version. It will split the hit and and associated bounties. Formulas will automatically take this into account since a player's hits will become fractional (1.5, for example, for a player who busted out one other player and then took part in a another bust-out).
Your formula:
150 + if(r <= 18, 300 + (18-r) * 50) + if(r < 17, 50) + if(r < 10, 100) + switch(r, 3, 50, 2, 200, 1, 350) + (nh * 50)