“Los Angeles County has added more than 475,000 jobs since the depths of the Great Recession, and it’s expected to gain another 334,200 jobs by 2020, according to a report released Thursday. But most of those jobs will be low-paying positions, the Los Angeles County Economic Development Corp. reported at the seventh annual Southern California Economic Summit . . . “We have 90,000 fewer manufacturing jobs than we did in 2007 and those were jobs that paid around $52,000 a year back then,” Cooper said. “We’ve added 90,000 additional food service jobs since 2007, but those are jobs that have an average annual wage of $20,000.””