Sales staff of the Mistel Shopping Mall as well as the supervisors are paid salary plus commission for all sales above GHȻ15,000.00. Sales staff earn a commission of 4.5% for sales above GHȻ15,000.00 up to GHȻ50,000.00. For sales above GHȻ50,000.00, they are paid an additional 3% commission on the excess of sales above GH¢50,000.00. Supervisors are paid a personal commission of 2.5% for personal sales above GHȻ15,000.00 up to GHȻ50,000.00 and an override of 3.5% on excess of store sales above GHȻ30,000.00. Senior supervisors are however paid 3% personal commission for personal sales above GHȻ15,000.00 up to GH¢50,000.00 and an override of 5% on excess of store sales above GHȻ30,000.00. Seidu is a senior supervisor and Selina is a supervisor. Issifu, Yaw, Adzo, and Adiza are among the sales staff. At the end of October, 2014, the store had total sales of GHȻ168,784.50 and returns of GHȻ16,780.00. An extract from the records of the Mall showed the following. Determine: • Personal commission of each staff • Gross earnings of the supervisors