How does a cost + % discount work?

Using the cost + % discount simply means taking the cost of the item you want to sell, adding a percentage to that base cost and making this the cost to the customers. This is sometimes called an inverse discount. This type of discount ensures you are able to cover your cost and better control your margin.

Ex: A pre-roll cost to a store is 5$. You add a 10% markup making the cost to the customer $5.50