At "Price", enter the total rental price. At "Participants", add the total number of people that'll pay. Afterwards, you can select the number of users that only used the rental for a part of the time, to calculate their shares.
Please use a dot (.) as a decimal instead of a comma (,)
Participants in Group 1 will have to pay
Participants in Group 2 will have to pay
Participants in Group 3 will have to pay
Participants in Group 4 will have to pay
Full time participants will have to pay