Damage resistance

Bob here has 25 EM res. on his shield. If he gets hit by a EM energy based shot on his shield, supposedly going to do 100 damage. How much damage does the res. reduce? Thanks 

From the other resistance threads, I had no hand at doing the math all the other people have been doing there is even graphs.




100 resist = +100% effective hp = 50% damage reduction

200 resist = +200% effective hp = 67% damage reduction

300 resist = +300% effective hp = 75% damage reduction

…and so forth