Need help with B and C.

Pharoah Horticulture provides and maintains live plants in office buildings. The company's 948 customers are charged $38 per month for this service, which includes weekly watering visits. The variable cost to service a customer's location is $17 per month. The company incurs $2,226 each month to maintain its fleet of four service vans and $3,456 each month in salaries. Pharoah pays a bookkeeping service $2 per customer each month to handle all invoicing and accounting functions. Sales Revenue $ 36,024 Variable Expenses Service Expense $ $ 16,116 i Bookkeeping Expense 1.896 Total Variable Expenses