Cry effect on my king and my units

How much do my king and units stats (and what stats) change if I use a cry effect (example: werewolf’s howl)?

Can my king and units become even more stronger if I use more cry effects concurrently (example: battlecry scroll + raging werewolf’s howl + Howl pal’s howl + yeti’s cry + tribal archer death’s cry)?

Yes it can, you can even see some real tests here:

 

Thanks for the answer, but in the first question I forgot how much king and units stats (example: resistance, damage, attack rate, speed, health, etc.) change in percentage if I use a cry effect.

I would also like to know this.