The following example shows a Quest that have configured a discount of 20% for the Variable Download but only for the Option 2.
This quest only can be unlocked by visiting the Variable Pricing Demo.
Earning this Quest you will get a discount of 20% on Variable Download
If you try to purchase this option of the download now, you will get the discount applied to your cart automatically.
Additionally, you can see that the discount will get displayed on the shop as well as on the single download page.