At day 18 on level 4, the AI not only buys the 2nd restaurant, but upgrades it and the original. It spends around $6,000 to do all this. As of day 18, my percentage is a smidge higher than it's....yet it suddenly has $6,000 to blow. Clearly, this game cheats at some point. Fun game, until you reach a level where the game stacks the deck entirely against you.