Does an 89.5 round up to a 90 in college?

To the nearest WHOLE number: This setting rounds the student’s average to the nearest whole number. With this setting, an 89.4% is rounded to 89%, and an 89.5% is rounded to 90%.

Is 89.5 a B+ or A?

To the nearest hundred is 100. If 90.0 is the cutoff, the OP’s 89.5 is a B+. If 90 is the cutoff, a whole number, you round to the nearest whole number, which would be a 90, which would be an A-. 89.4999999999 rounded to the nearest whole number is 89.