the following interview question came up recently:
BahnCard 25 costs 50 €
BahnCard 50 costs 200 €
BahnCard 100 costs 3000 €
(for international prepers: BahnCard is a loyalty card of the german railroad company that costs the stated amount and provides a discount which is given in the name)
1. How many kilometers do you have to travel to break even with each BahnCard (easy and solved)
2. From how many kilometers on exactly is BahnCard 100 the better choice?
To make it easy the interviewer assumed that 1km costs 1 €.
Thank you very much :)