The Field Trip Costs More Than the Permission Slip
The permission slip says twelve dollars. By the time it reaches the refrigerator, the trip also needs a sack lunch, a ride to school forty minutes early, a raincoat that still fits, and cash for the gift shop. The twelve-dollar trip is already gone.
A field trip is a school day with unusual edges. The destination gets the attention, while the money leaks through the edges: transportation outside the normal routine, food packed under special rules, clothes for weather, medication paperwork, a chaperone's lost work time, and the small purchase every child hears about before a parent does.
Put the whole day on one sheet before paying the first fee. This is not a reason to say no. It is how a family finds the real price soon enough to make the day work.
Circle every amount, deadline, departure time, return time, meal instruction, clothing request, and optional purchase. Then compare those details with the household calendar. An early departure may remove the usual bus. A late return may collide with child care, a work shift, a sibling's practice, or the only car in the household.