Transcript text: Andrew paid $\$ 30$ to buy a potato cannon, a cylinder that shoots potatoes hundreds of feet. He was willing to pay $\$ 45$. When Andrew's friend Nick learns that Andrew bought a potato cannon, he asks Andrew if he will sell it for $\$ 60$, and Andrew agrees, since he would have sold it for $\$ 45$. Nick is thrilled, since he would have paid Andrew up to $\$ 80$ for the cannon. Andrew is also delighted.
What is Andrew's producer surplus from the resale?
Select one:
a. $\$ 15$
b. $\$ 20$
c. $\$ 30$
d. $\$ 50$