Infused Channeling

I have quite a hard time figuring out how much damage is infused channeling on storm burst...

Would infusion give me like 10% more damage for the lightning and phys tag? resulting in a 44% more damage multiplier in total ? Is it more or less ?

If you convert all your physical damage to lightning and have no non-physical added damage, it should be roughly 50% more damage at level 20 ((100% + 10%) * (100% + 10%) * (100% + 24%)).