Final answer:
Nick must be selling his homemade chocolate cakes for $10 each.
Step-by-step explanation:
The given information states that Nick's Bakery incurs a cost of $3 to make one chocolate cake.
Let's assume Nick sells each cake for x dollars. To find the Producer Surplus, we need to find the difference between the selling price and the cost price of each cake. Given that the total producer surplus is $21 and that Nick sells three cakes, we can set up the equation:
- Producer Surplus = Selling Price - Cost Price
- $21 = 3x - (3 * $3)
- $21 = 3x - $9
- $21 + $9 = 3x
- $30 = 3x
- $30/3 = x
Therefore, Nick must be selling his cakes for $x = $10 each. So, the correct answer is option d) $10 each.