Variable price – quantity

It is possible to enter different unit prices as the quantity varies in a variable product?
Example:
1 piece of the product X size A costs 1 eur, 2 pieces of the product X size A cost 0.8 eur each;
1 piece of the product X size B costs 1.50 eur, 2 pieces of the product x size B cost 1.30 eur each;
and so on..
Thank you