Do not try to rollup the price of the components into the unit price of the bundle. Instead, use the managed fields that are already doing this calculation for you Package Total and Package Net Total. If you need a "unit price" value, you can create a formula field that divides these package total fields by the quantity of the bundle. Note that this would give you a "blended" unit price per unit of the bundle. It might be a fair representation of what you are trying to obtain, or it might not. Defining what the unit price of a bundle represents, is a business decision you have to make, and this drives the math to determine such unit price.