cadence dots question

quick question just to be sure:

if cadence does something like 400% damage on the 3rd hit, and you have something like 100 dot damage/sec for 5 secs (500 damage over 5)

would the dot that comes with the cadence attack be multiplied fully (2000 over 5) or just the next tick (400damage tick followed by 4 100damage ticks)?

also, i assume that the dot from the same skill line isn’t multiplied at all, it’s just that X damage with every 3rd hit, correct?