Former substitute teacher Roberta Halfacre Perry, who retired in December 2017, saved $7,117 toward a pension over 4 years working for public schools, Chicago Teachers' Pension Fund records show.

Over 30 years of retirement, Halfacre Perry would collect as much as $174,285, according to a projection by Local Government Information Services (LGIS), which publishes Chicago City Wire.

The projection assumes Halfacre Perry received $3,663 in the first year of retirement, then 3 percent annual increases thereafter, compounded.

After 2 years of retirement, Halfacre Perry will have already received $7,436 in retirement benefits, or more than the sum total of the retiree's contributions to the teachers' pension fund.