Answer:
Producer surplus USD 20 .
Consumer surplus USD 9.
Step-by-step explanation:
Producer surplus is:
Revenue - Total willingness to sell
The producer surplus would be = $(23 - 12) + (23 - 17) + (23 - 20) = USD 20
Consumer surplus is:
Total willingness to pay-revenue
The consumer surplus is $(30 - 23) + (28 - 23) + (20 - 23) = USD 9