Shake Shack is tumbling after missing big on sales

Fast-casual burger chain Shake Shack beat on earnings, but missed on sales on Wednesday.
The restaurant reported earnings of $0.14 per share against expectations of $0.13. Revenue also beat at $66.5 million for the quarter against expectations of $63.15 million, according to Bloomberg.
The firm also raised expectations for revenue to $253 million to $256 million for 2016, up from $245 million to $249 million.
The disappointment, however, came in sales growth.
Comparable store sales mis