Source:
CNBC 
KFC parent Yum Brands stock plunged on Tuesday after it missed Wall Street's earnings and revenue estimates. A key China metric also disappointed.
Yum Brands last dropped 18 percent in after-hours trade. This represents a decline of USD6.3 billion in value if the stock were to open at the same level, or slightly more than the market cap of a Dunkin' Brands and Shake Shack combined.