a) If the state covers 20% of the cost per month, that means the student has to pay 80%. So the cost per month for the student is:
2460 * 80/100 = 246 * 8 = 1968 kroner
b) The cost for 9 months would be:
1968 * 9 = 17712 kroner
I don't think it's proportional, because in order for a question to be a proportional question has/could be to be like this:
Gasoline costs $2.79 per 2 gallon. How much will it cost for 8 gallon. Then, we cross multiply and all to find the answer.
8 is the answer cuz if you dive and all that