San Diego-based hamburger chain Jack in the Box has posted net earnings for its Q3 ended 7 July up 15% to US$24.2m, compared with US$21m year on year. Year-to-date, net earnings increased 8.9% to US$69.1m from US$63.4m last year, with earnings per share (EPS) at US$1.72 versus US$1.6 a year ago.