We opened a nice discussion...
Mathematically, it is x1160 since the bet you placed is $1 although the base bet is $0.4 but the booster feature cost you additional $0.6 per spin. Of course, Little Mouse who manage the contest will be the one who decide whether your multiplier is x2900 or x1160.
Let me be honest. I haven't faced such issue earlier if I can remember. Since the base bet is $0.40, shouldn't it be 2900x? Beside, there was no mention of the booster feature either. I would rather ask the community to decide on this. If you ask me, I would say it's 2900x.
I always play with that feature on, if the slot has it of course.
The math is clear, but the trick with boosters is that payouts depend on the base bet. Base bet x multiplier = payout. So with a booster, we pay (risk) more for every spin, but the rewards remain the same as when we play without this feature activated. So if my bet was $1 I would have won $2900...
We can ask the question, does this feature affect the game and our chances of winning?
It says we have a higher chance to win a bonus and we pay extra for it, but when you experience 200-300 spins without a big win and end up with a bonus that gives less than x10 you wonder how true that is. It's not like it's happened to me once or twice... I have experienced it many times with many slots from different providers.
Well, there is a first time for everything. I think many players play with this feature activated, so there should be some rules about it. Like I said, I will accept whatever the judges decide... I have already mentioned all 3 options.