General

Clarification before enhancing and bonus question

So I'm about to enhance a 200att sword.
Zero enhancements have been applied.
What I know about enhancements:
For weapons; EE/AEE = +((W.Att/50)+1)Att per use. //round quotient down
i.e. 51-99att would gain 2att|100-149att would gain 3att|151-199att would gain 4att|200-249att would gain 5att
1. So... if I 5 star EE my sword, I'm assuming it will gain (5*5)att, right?
2. Also, if I were to 5 star EE at 199att, would it gain (4*5)att or (4+(5*5))att?
(The addition of +20att would apply because it was not yet 200att |or| an addition of 24att will be applied since it breaks the 200att barrier after the "first" enhancement)