Infraction: 3. All discussion should be both polite and civil.
Message to User:
Try not to be an asshole when you're explaining such things. Not everyone finds math easy.
lets take a simple math class...your dps without HFB is 1000.
Add to it the 15% increase from HFB and its 1150
oh wait, it got nerfed to only 10%, so your dps is now 1100
1100/1150 is 95.652%
100% - 95.652% = 4.348%
That is how.