How do you calculate selling price that involve carriage cost?

Answer 1

Carriage is transportation cost. If you are selling the product in your store, you would calculate how much it cost to transport the goods to your store, then factor in the per unit shipping cost.

Do a simple COGS (cost of goods sold) calculation.

Add the per unit shipping cost to the cost make or buy the product per unit, then add your profit mark-up, say 30%.