The supermarket displays the unit price for the 15.3-ounce box in terms of cost per ounce, but displays the unit price for the 24-ounce box in terms of cost per pound. what are the unit prices, to the nearest cent, given by the supermarket?

Many grocery stores do this calculation for you nowadays on the price tags! :) What you want to do is find the Cost per Ounce of cereal and look for the lowest number. In the first case, you have $3.37 per 15.3 ounces Thus take 3.37 / 15.3 and you get $0.2203 per ounce or 22 cents per ounce In the second case you have $4.59 per 20 ounces Thus take 4.59 / 20 and you get $0.2295 per ounce or almost 23 cents per ounce