Carl' s Coffee Emporium stocks only two decaffeinated coffees: French Roast and Mocha Java  Yusef only serves decaffeinated coffee, and the coffee he served after dinner last night was far too smooth and mellow to have been French Roast
So, if Yusef still gets all his coffee from Carl' s, what he served last night was Mocha Java
If Teresa does not fire her assistant, her staff will rebel and her department's efficiency will decline. Losing her assistant would also reduce its efficiency, so, if no alternative solution can be found, Teresa's department will become less efficient.