The Math

2014-15 UIUC Enrollment
• Freshmen – 6767
• Sophomores – 7553
• Juniors – 7799
• Seniors – 9728

74.5% of total undergraduates are from Illinois (but that number is not broken out by class).

So, we assume that 74.5% of each class is made up of in-state students.  That makes the in-state enrollment as follows:

2014-15 in-state UIUC Enrollment
• Freshmen – 5041
• Sophomores – 5627
• Juniors – 5810
• Seniors – 7247

2014-15 in-state base tuition = $12,036
2014-15 in-state base tuition AND fees = $14,946

Juniors:
5810 (# of in-state students) x $14,946 (tuition and fees) = $86.8 million
$21 million* (amount of savings) is 24.2% of $86.8 million
(*$21 million is the lowest current estimate; it will probably be more)
TUITION AND FEES LOWERED BY APPROX. 25% FOR IN-STATE JUNIORS

Seniors:
7247 (# of in-state students) x $12,036 (tuition) = $87 million
$21 million* (amount of savings) is 24.1% of $87 million
(*$21 million is the lowest current estimate; it will probably be more)
TUITION LOWERED BY APPROX. 25% FOR IN-STATE SENIORS

source of data: Division of Management Information Campus Profile, UIUC