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Lower Salaries Than Other Salesmen. While commission-based food salesmen earned $52,000 in 2013, all wholesale and manufacturing sales representatives earned average annual salaries of $64,300 as of May 2012, according to the BLS. The top 10 percent made more than $112,650 annually.
A Food Scientist earns an average salary of $59,538 per year. Most people with this job move on to other positions after 20 years in this career.