569/990 Is in simplest form.
481/990
220/990 = 2/9
220 are women.
220 out of 990 runners are women.
4 R 110
220
It is: 55/990 = 1/18
154/990 = 7/45
I believe that the 990 tax software is actually software that helps you fill out the tax 990 form. If it's even real software to begin with. All I can find is the tax 990 form. No software.
The term 990 tax software refers to software capable of completing IRS Form 990. That form is for businesses who are tax exempt, so unless you run a nonprofit organization, you shouldn't need to file a Form 990.
990