Sunland Horticulture provides and maintains live plants in office buildings. The company's 930 customers are charged $46 per month for this service, which includes weekly watering visits. The variable cost to service a customer's location is $26 per month. The company incurs $2,800 each month to maintain its fleet of four service vans and $3,800 each month in salaries. Sunland pays a bookkeeping service $5 per customer each month to handle all invoicing and accounting functions. What is the expected monthly operating income if 230 customers are added? $ Operating income