How to add a fixed value to an entire column?

[mikehende]

Hello, I am a wholesaler and have received an inventory spreadsheet with pricing for products from my Distributor, in order for me to send the sheet to my retailers, I first need to update the prices of each product to add my markup so if I should need to add $3 to every item's pricing, is there a way I can add the $3 to EVERY product's existing pricing and have th sheet updated to reflect MY pricing please?