Extra hours.. how much would you charge?

[dshtebazile]

I just recieved and email from one of my daycare moms asking me if I would be able to watch her daughter an extra 2hrs 1-2days every couple of months. I am going to say yes Im just not sure how much extra I should charge for this as this situation has never arised for me before.

Currently I have her from 9am-5pm, and charge $38 a day. I dont want too charge too much and seem greedy, but I dont want to charge too little and feel "used". I was thinking of saying $5 per hour- which would bring our day to $48.

Does this sound reasonable? How much would you charge?