Can you tell me how to calculate total sales, assuming the numbers include VAT of 19%, duty of 16% excluding VAT, freight of 5% including VAT, & cost of goods is 35% excluding, VAT, duty and freight?

Think about it this way, if COS = 35% Net sales = 100% so divide by 35 multiply by 100 then apply the duty, and apply the freight excluding VAT then add VAT to the number you now have.. Isn't it important to assess the performance excluding these imposts