Donald Trump's casino holdings may be slumping, but he still found a quick way to double his money. According to the Los Angeles Times, the ''Art of the Deal'' author has negotiated himself a raise for his starring role on NBC's ''The Apprentice.'' While NBC declined to discuss the figures, the paper cited sources as saying he would earn at least twice the $50,000 per episode he earns now. The deal covers the next two 16-episode seasons of the reality hit, so his on-camera take will add up to $3.2 million. That $100,000 per episode fee doesn't make him the highest-paid primetime personality, as he has boasted (that would be Ray Romano, who earns nearly $2 million per episode of ''Everybody Loves Raymond''), but the deal doesn't include his fee as a producer of the show or his take from merchandising. (Those new $14 ''You're fired'' coffee mugs could really add up.) By comparison, whoever Trump chooses as the ''Apprentice'' winner on Thursday's finale will earn $250,000 for a year-long stint at the Trump organization; now, The Donald will earn that sum just for saying, ''You're fired'' two and a half times.