The 10 fast-food chains with the happiest customers

Customer satisfaction is key to success in business, especially in the restaurant industry. Restaurants depend on both word-of-mouth advertising and repeat customers, and without them, their business tends to sink. Plummeting sales at Chipotle Mexican Grill(NYSE: CMG) following the recent E. coli scandal show how quickly things can go sour.

Let's take a look at the 10 fast-food chains with the happiest customers, according to the American Consumer Satisfaction Index. There were 17 restaurants on the list and these 10 topped the rankings on a scale of 0 to 100.