Priority on Promotion set up

Greetings,

If I have set more than one promotion on the same article (please see below examples), how will system consider the priority of each promotion?

For example,

Bonus Buy:

If the minimum sales amount of Article A greater than $100.00, there will be 20% of discount.

Discount:

Discount of 15% off will be granted to Article A for any purchase.

If the sales amount of Article A is $120.00, there will be 15% off or 20% off or both discount?

Thanks =)

WL