@nessabee , if you have been accepted into a 4-yr college, you should have a more exact amount than the “average cost of tuition”.
Speak to the finance department at the university and find out exactly how much this school year will cost. Find out exactly how much grant money you received. You and the finance department should be able to determine if the grant money will cover everything, and if you need (or don’t need) to pursue the subsidized loan.
BTW, since you did not mention it, I assume you will not be living on campus. If you will be living on campus, don’t forget to factor in room+board.