How much can Senior year First semester hurt me? (Mid-year report)

So, I’m applying to Ross Undergrad School of Business.
And on my first semester of senior year at high school, I have all A’s except for an 80 in AP Calculus.
My counselor already uploaded the mid-year grades on common app and I had to submit it.
How much would the 80 hurt my chances? I feel bad now because UM does not even require mid-year grades.

If you already got into umich (but not yet Ross), then the B grade may hurt your chances of getting pre-admitted into Ross, but will not get your admission from umich revoked. You just need to avoid C grades or below.

I have not been accepted yet. In fact, I submitted my application recently

Well they can assume that you waited until now to apply because you wanted them to take into account your first semester senior year grades. The B can sting a bit, but shouldn’t hurt you that much. However, you will definitely have a harder time than if you had applied early action. Due to the rolling admission process, the fact that you waited this late means that you are competing against other applicants for fewer open seats, making it more competitive.

Alright. Thank you so much!