we know that
Unit Rate is the ratio of two measurements in which the second term is [tex]1[/tex]
we have
[tex]2\frac{1}{2}\ liters=\frac{2*2+1}{2}=\frac{5}{2}\ liters[/tex]
so
Corey bought [tex]\frac{5}{2}\ liters[/tex] of paint for [tex]\$60[/tex]
by proportion
Find the cost of one liter of paint
[tex]\frac{60}{(5/2)}\frac{\$}{liters}=\frac{x}{1}\frac{\$}{liters} \\ \\x*\frac{5}{2}=60\\ \\ x=2*60/5\\ \\x=\$24[/tex]
therefore
the answer is
the cost per liter of the paint is equal to [tex]24\frac{\$}{liter}[/tex]
