Hello, I'm new to Odoo,and trying to workout how to put our pricing model in Odoo the best way.

I have the following product I would like to put in Odoo as 1 product, but I can't find how to do this.

I have a product we sell in predefined numbers, for a price per bundel:

10 for € 49,-
30 for € 129,-
75 for  € 299,-
125 for  € 459,-

etc

You can only choose the above mentioned amounts. 

What would be the best approach to put this in Odoo? I thought of these 2, but I'm open for better suggestions:

- separate products?
- separate Product variants?
- ...