Progressive prices

I purchased the entire WordPress Theme but I tried to set tour variation in order to obtain progressive pricing I asked for… but I failed.. maybe I didn’t understand how… may you help me?

This is what i need: If I book for 1 or 2 persons the price will be for example € 100 If I book for 3 or 4 persons the price will be for example € 120 If I book for 5 or 6 persons the price will be for example € 200

and so on… Thank you in advance