If you are using WooCommerce Gravity Product Add-ons , you will need to add the following code snippet so that the discount is applied on the product and the addon

Click the below button to see the snippet.

How to Add the Code Snippet:
Method 1: Easier

Using the Code Snippet plugin  - Its a free, useful plugin

Method 2: 

Adding the code snippet to your theme's functions.php file 

Using this snippet, it is only possible to set discount on both the product and the add on.
Providing discount only on the product or only on the add on is not possible. 

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