Answer:
$24 per liter
Explanation:
Corey bought 
 liters of paint for $60.
 liters of paint for $60. 
Unit rate : Cost of paint per liter. 
First change mixed fraction to fraction. 
 liters of paint
 liters of paint
Cost of 
 liters of paint = $60
 liters of paint = $60
 Cost of 
 liter of paint =
 liter of paint = 

 = $24
Hence, The cost per liter of paint is $24