Ziva is an organic brocolli farmer, but she also spends part of her day as a professional organizing consultant. As a consultant, Ziva helps people organize their houses. Due to the popularity of her home-organization services, Farmer Ziva has more clients requesting her services than she has time to help if she maintains her farming business. Farmer Ziva charges $40 an hour for her home-organization services. One spring day, Ziva spends 9 hours in her fields planting $130 worth of seeds on her farm. She expects that the seeds she planted will yield $300 worth of brocolli.

Required:
What is the total opportunity cost of the day that Farmer Ziva spent in the field planting brocolli?