DAX Measure based on if statement from different aggregations

Hello everyone,

I have a problem calculating the total in a matrix visualization using a measure with an if statement. I created this simplified model to ask this doubt.

The goal is to create a measure that:

- offers a 50% discount on books if customers bought more than 40% regarding the previous year and no discount otherwise

- offers a 20% discount on the other products (pens and pencils) if customers bought more than 30% regarding the previous year and no discount otherwise

- even if the above is fulfilled for some products, there will be no discount if in the sum of all the products the buyer didn't buy more than 10% compared to the previous year

I send the screen of the matrix summarizing what I should achieve:

Thanks in advance!

Sample data:

https://drive.google.com/drive/folders/14_aZz5wd2W6SdXZoWwTfPX_JXQUBh2k4?usp=sharing