Do you really want to take this on? These would be the two absolute worst days for me to have to work late. I'd be so resentful and angry all the time if I ever found myself agreeing to working that schedule.
I would charge your regular 10/hr over time with a weekly rate. - or just your regular weekly rate. I would bet this schedule is hard to find daycare for, so they should be willing to pay for it. It wouldn't be worth it for me personally though. Good luck in your decision!
