This week I have paid
£10.50 for ds1 trip
£14.80 for ds2 trip
£5.00 for dd3 trip
Now dd4 has come home from nursery with a request for £17.80 for a trip to a local farm. 
All the letters state the money is a contribution but if enough parents don't pay the trip will not go ahead.
We are lucky enough that we can afford it. I have no problem with parents on a low income only paying a small percentage.
I just wonder if there are any parents out there who can afford it but choose not to pay.