22 in SB (What needs to happen?)

[halis123456789]

Okay let's say we have 22 in the SB, everyone folds to MP2 who raises, everyone folds to SB, and let's also assume the BB will fold.

In a $5/$10 game there would be $17 in the pot, $8 to call, pot odds of 2.125, we are 7.51 to 1 to hit trips on the flop, so this would be an easy fold. Right?

So, what are the odds we generally need to call here? 4 to 1? Suppose there is an MP limper, an LP raise, and a reasonable chance the BB will call. Is this the minimum to call here?

Blinds (7) + Limper (5) + Raiser (10) + BB Call (say 60% *5=3) + Limper Call (5)
Total Pot = 30 (discluding the money we would put in the pot)

30 / 8 to call = 3.75 to 1

Would this be enough to try and hit the trips? Could we call with less than this? Would it take more?

Also, how much more would it take to call two cold on the button, with 22?