Green with Envy provides environmentally friendly lawn services for homeowners. Its operating costs are as follows. Depreciation $1,500 per month Advertising $200 per month Insurance $2,000 per month Weed and feed materials $13 per lawn Direct labor $12 per lawn Fuel $2 per lawn Green with Envy charges $60 per treatment for the average single-family lawn. Determine the company's break-even point in (a) number of lawns serviced per month and (b) dollars