$250/month for children 6-18
$300/month for children 5 and younger
Birthdays calculated as of 12/31/21
Ok, I made the calculations.
The first 2 month's payments were each $150 less than they should have been.
The third month's payment was $626 more than the previous 2 months.
So even if they were back-paying the missing $150 x 2, the third month should be $450 more not $626 more.