We also need to consider property management fee, which is about 10% of the rent income, since students usually move around in 1 year or so. So
Annual income:54*600*10=324000
Cost:
tax: 30k
util:200*18*12=43200
insurance:5k
maintenance:20k ? Maybe too low
PM FEE: 32.4k
Net: 225800 -32400: 193400