How can i calculate my EV in this games ? i think the std EV stat in spins is for 3handed but what about 4handed spins ? and how can i add bountys? if anyonw knows i really appreciate that thanks

Here's my math for it, don't know if it's right. Assuming you win the game, half the time the bounty will be either you or your last opponent. Therefore, you get the bounty prize half the time. 1/4 of the time, the bounty will be your second to last opponent, and since there are two people who could take him out, you will get the prize half of those times. The same way, 1/4 of the time the bounty will be the first guy to get taken out, and there will be 3 people who could do it, so you will get it 1/3 of the time. For simplicity, I ignore the scenario where you win the bounty but lose the game.

1/2 + 1/4*1/2 + 1/4*1/3 = 17/24 = 0.71
Therefore EV = 1st place prize + 0.71bounty. This multiplied by the weighted average of the jackpot.