The average extra help salary at Corona was $41,619 , which is 983 percent higher than the average salary for this job in California, and 1047 percent higher than the national average for this job . Extra Help salaries at Corona typically range from $26,282 to $72,292 (25th to 75th percentile). The highest reported extra help salary was $72,292. There are 6 employees at Corona with the job title extra help.