Sam appointed Nal as an agent to sell a piece of property owned by Sam. Sam states that the price to be obtained must be at least RM500,000. Nal discovers that because a shopping mall is planned for the area of Sam property, the fair market value of the property was at least RM700,000 or higher. Nal forms a real estate partnership, Rick Realty, with her cousin Jo and enters into a contract on Sam's behalf to sell the property to Rick Realty for RM500,000. Nal does not declare her interest in Rick Realty. Rick Realty later sells the property to an investor for RM900,000. Discuss what action (if any) Sam could take against Nal.