Final answer:
The selling price of the article is determined by adding the profit of $720 to the cost price of $480, resulting in a selling price of $1200.
Step-by-step explanation:
To calculate the selling price of the article when the trader makes a profit of $720 on a cost price of $480, you simply add the profit to the cost price. Here's the calculation:
Selling Price = Cost Price + Profit
Selling Price = $480 + $720
Selling Price = $1200
Therefore, the selling price of the article is $1200.