department analsis

A retail store has three departments and does general advertising that benefits all of its departments. Advertising expense totaled $50,000 for the year, anddepartment sales were as follows:

Department 1 $78,375
Department 2 $245,375
Department 3 $151,250

How much advertising expense should be allocated to Department 1?
a. $8,250 b.$28,829 c.$15,920 d.$50,000