Subway, which sells mostly submarine sandwiches and salads, has 34,679 stores in 98 countries across the globe.
The restaurant, which has an ''Eat Fresh'' slogan, says its food is a healthy alternative to other fast food.
The submarine sandwich empire started as a single shop in Bridgeport, Conn., in August 1965. Fred DeLuca was looking for a way to help pay for his medical education. His family friend Dr. Peter Buck loaned DeLuca $1,000 to start his business. Subway was the result.
The business partners wanted to open 32 stores in 10 years, but by 1974, they only had 16. That was what prompted them to start franchising.
The popular franchise has a relatively low franchise fee of $15,000. Startup costs for a moderate restaurant are $187,250.
Between 2005 and 2010, 42 of the 894 SBA-backed loans failed.
This list features the most popular franchises over the past decade -- and how well their owners have done at repaying startup loans backed by the SBA. More
|'Mission: Impossible - Rogue Nation' nabs third best Tom Cruise opening|
|China's huge factory sector is struggling|
|America's Act II: Will the economy come back?|
|Upgrading from Windows 7 or 8? You'll love Windows 10|
|Bitcoin: The hottest game for Chinese gamblers|