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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. Per Unit Sales Revenue 42780 46 Variable Expenses Service Expense 24180 i 26 Bookkeeping Expense 4650 i 5 Total Variable Expenses -28830 -31 Contribution Margin 13950 $ $15 Fixed Expenses Vans Expense 2800 3800 i Salaries Expense -6600 i Total Fixed Expenses 7350 Operating Income (b) What is the expected monthly operating income if 230 customers are added? $ ta Operating income