Atlanta and Champaign, Ill. — Inspire Brands Inc., the parent company of Arby’s, has agreed to acquire Jimmy John’s Gourmet Sandwiches. Terms of the transaction, expected to close by the end of October, were not disclosed. The Jimmy John’s board of directors, including founder and chairman Jimmy John Liautaud, unanimously approved the agreement. Jimmy John’s had $2.15 billion in U.S. sales last year across 2,803 stores, a roughly 50% increase in both sales and locations since 2013, according to The Wall Street Journal. Jimmy John’s, based in Champaign, Ill., opened …