Question

A bottle of cranberry juice contains 32 fluid ounces and costs $2.56. What is the unit rate?

Answer 1

unit rate is (cost) per 1 unit
the unit is fluid oz
'per' is fraction
cost/1unit
so we do
2.56/32
divide completely
2.56/32=0.08/1
the unit rate is $0.08 per oz

Answer 2

So,

32 fl. oz. costs $2.56.  To find the unit rate, we need to divide 2.56 by 32.

This is a special case, because we notice that 256 and 32 are perfect powers of 2.

$\frac{256}{32} = \frac{2^8}{2^5} =2^3=8$

The cranberry juice costs 8 cents per fluid ounce.