I need help finding the %

Macee Department Store has three departments, and it conducts advertising campaigns that benefit all departments. Advertising costs are $100,000 this year, and departmental sales for this year follow. Depart-em: Sales 1 5109,0005 2 315,\" 3 126,000 How much advertising cost is allocated to each department lime allocation is based on departmental sales? 0 139.000 5 100.000 5 30.000 0 100.000 50.000 .- '- 126.00 a 100.000 20.000 5 a s