Score	Grade
[90, 100]	A
[87, 89]	A-
[84, 86]	B+
[80, 83]	B
[76, 79]	B-
[73, 75]	C+
[70, 72]	C
[66, 69]	C-
[64, 65]	D+
[62, 64]	D
[60, 61]	D-
[0, 59]	F