The "exam total" column was obtained by taking the larger of two numbers, the first of which was
0.3 * (first exam)  +  0.3 * (second exam) + 0.4 * (final exam percentage), and the second of which was
0.125 * (min of 2 exams) + 0.375 * (max of 2 exams) + 0.5 * (final exam percentage).
The overall percentage is  0.2 * homework + 0.8 * exam total.
hmwk		e1		e2		final		exam total		overall		grade
[100]		[100]		[100]		[200]		[100]		[100]
82.6		88		97		164		88.375		87.22		a
89.5		91		93		151		85.4		86.22		a
75.8		87		90		151		83.3		81.8		a
81.6		90		80		147		80.5		80.72		a
72.6		84		75		148		77.875		76.82		b
79.5		73		79		123		70.2		72.06		b
63.7		63		78		146		73.625		71.64		b
61.1		87		83		114		73.8		71.26		b
65.8		43		80		127		67.125		66.86		b
57.9		74		81		108		68.1		66.06		b
57.9		48		74		137		68		65.98		b
58.4		71		70		88		59.9		59.6		c
51.1		72		57		106		60.625		58.72		c
58.9		74		68		76		57.8		58.02		c
45.3		64		61		102		57.9		55.38		c
41.1		67		53		100		56.75		53.62		c
72.6		49		58		82		48.5		53.32		c
36.3		64		60		96		56.4		52.38		c
43.2		51		59		84		49.8		48.48		c
37.4		63		44		87		50.875		48.18		c
43.7		59		56		70		48.5		47.54		c
47.4		36		51		68		40.625		41.98		d
56.8		40		28		71		36.25		40.36		d