Final answer:
The price per card is calculated by dividing the total price of the package ($13.80) by the number of cards in the package (6), resulting in a price of $2.30 per card.
Step-by-step explanation:
To determine the price per card when a package of 6 trading cards is sold for $13.80, one needs to divide the total price of the package by the number of cards in the package.
Price per card = Total price of the package / Number of cards in the package
Price per card = $13.80 / 6
Price per card = $2.30
Therefore, the price per individual trading card is $2.30.