For example the median expected annual pay for a typical Sales Assistant II in the United States is $42,052, so 50% of the people who perform the job of Sales Assistant II in the United States are expected to make less than $42,052.Source: HR Reported data as of October 2015. 1  Salary. 2  Salary + Bonus.3  Benefits.or example the median expected annual pay for a typical Sales Assistant II in the United States is $42,052, so 50% of the people who perform the job of Sales Assistant II in the United States are expected to make less than $42,052. Source: HR Reported data as of October 2015.