Answer:
B. $2 per unit
Explanation:
The computation of the price of Y is shown below:
As we know that the condition of the utility maximization i.e ratio of Marginal utility and the price should be matched and equal for both the goods given in the question
For one good
= Marginal utility ÷ price
= 40 ÷ $5
= 8
And, for the other goods
Marginal utility ÷ price = 8
16 ÷ Price = 8
So, the price is $2 per unit
Hence, the correct option is B.