Bill and Krista sell potted plants from a roadside stand. The figure to the right shows Bill
and Krista's marginal cost curve and the market price. If Bill and Krista sell 60 plants per week
at $8 per plant, their producer surplus from all their plants is
OA. $480.
OB. $8.
OC. $0.
OD. $240.
O E. More information is needed to answer the question.