Burst Fire maxed. Now what?

160% + 200% = 360% flame.
130/120% + 200% = 330/320% splitter.

It doesn't triple it's damage.

But how do you know that for sure? I need to see some numbers. The skill description in all its glory just says 200%, not +200%. So I wont know what to believe until i test it myself or someone else does.