How much does the day ticket for Germany cost?

1 passenger: 
Total price: EUR 49
Price per person: EUR 49

2 passengers:
Total price: EUR 59
Price per person: EUR 29.50

3 passengers:
Total price: EUR 69
Price per person: EUR 23

4 passengers:
Total price: EUR 79
Price per person: EUR 19.75

5 passengers:
Total price: EUR 89
Price per person: EUR 17.80