In 2002, median annual earnings of salaried sales worker supervisors of retail sales workers, including commissions, were $29,700. The middle 50 percent earned between $22,790 and $40,100 a year. The lowest 10 percent earned less than $18,380, and the highest 10 percent earned more than $55,810 a year. Median annual earnings in the industries employing the largest numbers of salaried supervisors of retail sales workers in 2002 were as follows:
 

In 2002, median annual earnings of salaried sales worker supervisors of nonretail sales workers, including commission, were $53,020. The middle 50 percent earned between $37,680 and $77,690 a year. The lowest 10 percent earned less than $26,780, and the highest 10 percent earned more than $114,210 a year. Median annual earnings in the industries employing the largest numbers of salaried supervisors of nonretail sales workers in 2002 were as follows:
 

Compensation systems vary by type of establishment and merchandise sold. Many supervisors receive a commission or a combination of salary and commission. Under a commission system, supervisors receive a percentage of department or store sales. Thus, supervisors have the opportunity to increase their earnings considerably, but they may find that their earnings depend on their ability to sell their product and the condition of the economy. Those who sell large amounts of merchandise or exceed sales goals often receive bonuses or other awards.