Question about partner discounts / vendor promotions

I have a question about vendor promotions and partner discounts.

Can these two discounts be combined?

I have a client I have given X% promotion to but they want/allowed to only buy our product through their atlassian partner. Can the partner give a Y% discount in addition to my discount? Or do these two actions rule out each other?

Partner will able to purchase your app with X+Y% discount. After that it is up to the partner what they will charge to the customer.