You should ask for a concrete numbers. Some parents may not be fully aware of what American colleges cost, or may be under the impression that the universities they have in mind for you will provide significant merit aid if you are admitted.
“Quite high” might be $20K/yr to one family, but $80K/yr to other families. Knowing exactly what your parents can afford to pay (and knowing the NPC results) will be very helpful in helping you formulate a list of universities for which to aim.