This is an application of the ideal gas law in the form of (P1V1)/T1 = (P2V2)/T2
Since you want to find P2... rearrange the equation to the form of (P1V1T2)/(T1V2) = P2
You need to convert your temperatures from Celcius to K by adding 273 to each.
P1 = 88.89 atm
V1 = 17L
T1 = 67 +273 = 340 K
V2 = 12 L
T2 = 94 + 273 = 367
P2 = ?
My rough estimate puts it at about 135 atm