It’s a rough estimation depending on the stats of the enemy you’re fighting 18+12+18 is 48 which is pretty close to 50%. The basis of it is how much more damage you do to the enemy with said items. Not what gives you more pen.
It is a jug but it didnt benwfit trynds, hob went off on the 2nd auto instead of the first, it delayed when it was already available for some spaguetti code reason