How much does the day ticket for Germany cost?

1 passenger: 
Total price: EUR 44
Price per person: EUR 44

2 passengers:
Total price: EUR 51
Price per person: EUR 25.50

3 passengers:
Total price: EUR 58
Price per person: EUR 19.33

4 passengers:
Total price: EUR 65
Price per person: EUR 16.25

5 passengers:
Total price: EUR 72
Price per person: EUR 14.40