Traveling expenses

For our project we are hoping to do some interviews with experts. We expect to do around 3 interviews. Each time 2 or 3 people will go to take the interview. We estimate the traveling expenses for a single ticket full price at around €20,- . As we are able to travel with student discount, this will be €12,- for a single ticket. For 2-3 persons this will be €60,- per interview, so €180,- in total.