Buncombe County Schools are on a 10 point grade scale.
90 - 100 - A
80 - 90 - B
70 - 80 - C
60 - 70 - D
59 -50 - F
A 50% is the lowest score your child can achieve on an assignment.
Also, I drop the lowest grade in each subject before I post final reporting grades. (Everybody has a bad day.)