Answer and Explanation:
The classification is as follows:
1. Advertising expenditure - Variable cost
2. Fuel - Variable cost
3. Interest on company-issued bonds - fixed cost
4. Shipping charges - variable cost
5. Payments for raw materials - variable cost
6. Real estate taxes - fixed cost
7. Executive salaries - fixed cost
8. Insurance premiums - fixed cost
9. Wage payments - variable cost
10. Depreciation and obsolescence charges - fixed cost
11. Sales taxes - variable cost
12. Rental payments on leased office machinery - fixed cost
