A~ = 95-100, A- = 90-94,\\
B+ = 85-89, ~B~ = 80-84, B- = 75-79, \\
C+ = 70-74, ~C~ = 65-69, C- = 60-64,\\
D+ = 55-59, ~D~ = 50-54, D- = 45-49,\\
E~ = 0-44.