If you know the unit prices of two different brands of an item you are better able to? a. compare the prices of the two brands. b. estimate how much of the item you will need. c. determine which of the two brands is higher quality. d. figure out the discount during a sale on the two item.

If you the unit prices you know the cost per unit.  For example, you would be able to compare possibly a price per one ounce of Dasani water and a price per one ounce of Aquafina water.  This makes it super simple to compare the prices of the two brands when they are both written as a unit rate (of course, the units would need to be the same to make the comparison).

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