Old Total: $1896.33
+ $80 overnight babysitting
------------------------
New Total: $1976.33

I was expecting $90 last night ($50 for last night + $40 in "back pay" from Monday). I'm not sure if The Mom forgot that she paid me $30 rather than $40 last time, but effectively I was only paid $10 for coming early the other night. If it turns out they are only going to pay me $10 to come early, I probably won't be so willing to do it. I completely understand that this arrangement isn't cheap, but coming early at the drop of a hat kills my night at home, and $10 isn't enough for that.

However, all in all, this arrangement is working out.