Need help please , Im a noob!

I want an example of calculating promotion that contains list of purchases each brand brands have promotion with service factory

Robot, this seems more like a generic angular query. Looking at this and your other queries Iā€™d suggest perhaps that you have go at following this tutorial https://docs.angularjs.org/tutorial/ and if you have further issues that you try to be more explanatory in your requests and, if possible, put together some CodePens to help other users help you.

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