I charge $100/week which works out to be $20/day. this does not depend on weather or not I do school/bus runs.
This year I do not do school runs or bus pick ups. the children I have are old enough to walk to and from the school (across the street) on their own.

Next year my oldest will be starting school so I will be doing school runs. I flat out refuse to stand and wait for a bus.

for just after school or just before school I change the same as above. My spot is for both b&a school, how much of it they use of it is up to them.