The $100 million figure is after luxury tax.
$75 million plus $10 million for Millsap, equals $85 million, which after luxury tax payments would become $100 million. It'll be a bit under that, but that's the ball park figure.
$75MM plus $7MM (his first year contract is likely to be only around $8M and they already have $1M in that $75MM number) ... is equal to $82MM. It will be $93M.
Maybe it is the fact that I'm in op planning mode right now, but $7M is not ballpark to me 
Haha ... yeah, quite possibly ...
I have Millsap earning more than you do --
started half the season, averaged 16ppg and 10rpg while playing starters minutes, plus played good defense, and posted the most consecutive double-doubles since 2005 (KG) -- I think the baseline for his next contract will be up around $50 million over five years, which would have him earning around $8.5 million next season. I think he'd be doing quite badly for himself if he failed to get a contract like that. I also think there's a fair chance he gets more than that.
I also have a few extra million on the Jazz's payroll for empty roster spots which got me to $75mil in the first place
(not including Millsap). That brings me to be between $83.5-to-$85 million depending on where Millsap's contract ends up, which goes up to $97-100 million after luxury tax payments.