Double Barreling Quiz

I'll rough math because why not.

gutshot is 8% but Ill call it 10% out of laziness.

EV when he calls is:

Lose $2 90% of the time = -$1.80
Win $3 10% of the time = +$0.30
= -$1.50

[edit] fail. We win $5 when he calls and we win. Final answer is smaller than I said first [/edit]

So If a call costs us $1.50 and a fold wins us $3 we need him to fold once for every 2 calls to break even => 33%.