Use division to find the price per ounce for the bulk cranberries and the package of cranberries round to the nearest cent (1 pound = 16 ounces )

Bulk cranberries cost .15 cents per ounce without the package. 
bulk cranberries cost .33 cents per ounce with the package.
8 ounce packages cost .18 cents per ounce without the package.
8 ounce packages cost .56 cents per ounce with the package.

so, the bulk cranberries are a better buy

Where are the calculations?