Borderlands weapon damage question.

Hey, i recently got a new sniper that has 400 damage, but has 150% more damage in that box underneath the stats, im just wondering if the damage that is shows (400) is the damage with the 150% or does it work like there is 400 damage + 150% of the 400 damage added on?

+150% damage bonus applies to "Critical Hits"... Human enemies = headshots LINK