Which has the best unit rate? 16 oz for $4.25 or 20 oz for $ 4.55 i chose 16 oz but i need to make sure it's right

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?