Drupal Commerce - product attribute price based on quantity I'm here with a tricky question about Drupal Commerce.
Here's my need: 


I have a group of products that have a variable price based on quantity.
Each product has specific (only for that product) attributes that can modify the price.
[The real problem] Each attribute price is variable based on the original product quantity.


A real example: 
0-300 pieces -> 0.75€
300+ pieces -> 0.52€

OptionA 0-300 pieces -> 0.07€
OptionA 300+ pieces -> 0.05

So if I buy 400 pieces + OptionA i pay 0.52+0.05 each, but if I buy 200 pieces I pay 0.75+0.07.

Basically what I want to achieve is to have the attribute price dinamically changed depending on the quantity.

How could I achieve such result? I can't really find a way.
Thank you in advance!
You may decrease price by setting up the rule on "After product added to cart" event, checking up the quantity added and calculate discount in a way you want to, for example.