The Bill of Materials (BoM) for the Samsung Galaxy Note 20 Ultra 5G (128 GB variant) has been estimated at a total of US$548.90. As the flagship device currently has an official retail price of US$1,299.99, then this BoM cost is equivalent to 42.22% of the Galaxy Note 20 Ultra 5G's price tag. The display and the communication components are the priciest parts.
https://www.notebookcheck.net/The-Samsung-Galaxy-Note-20-Ultra-5G-has-a-Bill-of-Materials-cost-of-US-548-90-or-42-of-the-US-1-299-99-price-tag.492874.0.html