Which option has the lowest price per ounce: A) 16 oz for 4.00, B) 20 oz for 5.20, or C) 32 oz for $7.68?

Find the price per ounce of each option. Option A is $\frac{4.00}{16}=0.25$ dollars per ounce. Option B is $\frac{5.20}{20}=0.26$ dollars per ounce. Option C is $\frac{7.68}{32}=0.24$ dollars per ounce. Option C has the lowest unit price, choice C. Choice A names a correct unit price, but it is not the lowest. Choice B names the highest unit price. Choice D is wrong because the three unit prices are different. The largest package is not always the best value, so always compute the unit price.