A 4-liter jug of windshield washer fluid is priced at $5.20. What is the unit price per liter

To find the unit price per liter, you divide the total price by the total number of liters:

$5.20 / 4 liters = $1.30 per liter

So, the unit price per liter of the windshield washer fluid is $1.30.