For this case we have that the unit cost is given by:
\(r = \frac{y}{x}
\)
Where,
y: total cost
x: amount of total juices per box
Substituting values we have:
\(r = \frac{4}{8}
\)
Simplifying the obtained expression, we have:
\(r = \frac{1}{2}
r = 0.5
\)
Answer:
The unit rate for the juice boxes is:
\(r = 0.5\)