Single room or roommate?

Let me break it down for you and i was given some incorrect info from my boss so its more updated, the 1500 dollars is from the state of idaho, its about 35% of what they would’ve spent on me if i stayed for that year, 700 in tuituion assistance from my job at the beginning i believe, and my parents know that i’ll be getting that amount because i’m their 3rd child going to college and we aren’t doing loans unless we need to, and according to the fafsa estimator, i’m getting 5,665 from the pell grant, so that equate to approxamatley 9k, and theres also scholarships i’m going to get to hopefully cover the rest and if not i can work and save up and even then if i can’t, my grandfather has a military pension and said as long as it’s not an insane amount, he’d help anyone in my family with college cuz he doesn’t want anyone to owe 1,000’s in loans.