Change dollar sign?

Hello,

i have found it. but now i have an other question.
i want to add in extra’s a field with persons with a minimum of 30 persons and a maximum of 300 persons for each person it will cost 19.5 euro’s.

i can’t find a way to do this the only way is to add it one by one. that wil cost me a lot of time.

please help!!

Many thanks in advance!