Teresa rents out an apartment over her garage for $800 per month, for a total of $9,600 per year. The apartment is 750 square feet, while the remainder of her house is 2,000 square feet. Last year, Teresa made total mortgage payments of $19,800, which included $4,600 of principal. She paid a total of $650 for house insurance, $2,800 in property taxes, $3,600 for utilities and $400 for lawn maintenance services. She also paid $360 to provide extra cable TV service solely to the apartment, and $200 to steam clean the carpets in the apartment. What is Teresa's net rental income?