Total monthly bills
$597.75
Per person (1/4 total)
$149.44
Per person AC share
$48.75
Per person non-AC share
$100.69
Who pays whom
| Matthew pays Brenda | $149.44 |
| Renee pays Brenda | $149.44 |
| Brenda's own share (into the pool) | $149.44 |
| Pool collected (all three shares) | $448.31 |
| Minus: AC bill Brenda already paid | −$195.00 |
Brenda writes a check to Leon
$253.31