The units price are:
Then brand A is the better option.
If you know that a set of N items has a price P, then the unit price is given by the quotient between the price and the number of items that you get, N.
For Brand A, we know that there are 25 spoons for $1.99, then in this case the unit price is:
a = $1.99/25 = $0.0796
For Brand B the set has 42 spoons for $3.89, then the unit price is:
b = $3.89/42 = $0.0926
So we can see that Brand A has a lower unit price, meaning that is a better option.
Learn more about unit prices:
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