A cleaning business provides cleaning services to individual offices in commercial buildings. The company's 120 customers are charged $900 per month for this service, which includes weekly visits. The variable cost to service a customer's location is $220 per month. The company incurs $15,000 each month to maintain its equipment, service vans and other administrative costs. They also incur $30,000 each month in salaries. The cleaning business pays a CPA firm $50 per customer for accounting services. Required: Prepare the contribution format income statement for the month for the cleaning business.