ZZ Tire Company opened a new location last year. Use the following information to figure out contribution margin and operating income for last year:

Tires sold: 15,000

Retail Price per tire: $75 per tire

Cost per tire: $18 per tire

Installation expense per tire (payroll): $9 per tire

Utilities: $2,000 per month

Rent: $3,500 per month

Clerks and phone receptionist: $2,500 per month

NOTE: Advance managerial accounting