Figuring out the Roi for my townhome

[Juan Fernandez]

So i have been going over the formula of Roi and entering my information about my house. For some reason i have been returning a negative 27 on my roi which i thought was wrong. If i put 3,500 $ down on my first house and currently renting it out for 1,100 $ a month and having a 275$ income from this townhome. so that comes out to 2,700 a year of profit, why am i getting negative numbers?