To calculate the price after a discount, you can use the following formula:
Final Price = Original Price – (Discount Percentage * Original Price) / 100
In this case, the original price is $13 and the discount percentage is 20%. Plugging these values into the formula gives you:
Final Price = $13 – ($2.60 * 100) / 100
Final Price = $13 – $2.60
Final Price = $10.40
So, with a 20% discount, the final price of the item would be $10.40. This means that you would save $2.60 on the original price of $13.