50 Ill. Adm. Code 2500.80
Calculation Guidelines
Section 2500
Section 2500.80 Calculation
Guidelines
a) All calculations shall be rounded to whole numbers by rounding
down if the first decimal place is five or less and rounding up otherwise.
b) For all calculated amounts owed, a whole dollar amount shall
be reported and any amount calculated should be rounded down if $0.50 or less
and rounded up otherwise.