I am trying to figure out the DPS for a weapon system in a game called Mech Warrior Online. On a double shot (firing 2 bullets at one time) there is a 25% chance to jam the weapon. The jam time is 5 seconds. The rate of fire is 1.1 seconds. I would like to know the DPS of firing double shots for 1, 2, and 3 UAC5s at the same time factoring in the chance to jam. The jam only effects 1 weapon at a time and they all have an equal chance to jam. Since the jam effect can happen on any shot, we will need to calculate it for 1-10 continuous double shot firing. For example, 1 shot with 1 cannon has a 25% chance to jam etc. I was a math minor many moons ago, but have forgotten much of my stat class. Could someone help me figure this out? Perhaps a table in excel?