I really like to know three questions.

For example 100k dps withouth buffs, how the % damage in Natalya's armor is calculated (+% damage grenades) or similars armors bonus items?

Is calculated over the total dps withouth buffs, damage weapon, grenades damage,...?
The same question with criticals shoots.
What would be better? a 11% damage grenades ring or and 30% critical damage in a ring.

Thanks.