Opportunity cost refers to the benefits that people give up for other uses when they fix a resource to a certain use. Based on the above definitions, Which of the following are not included in opportunity cost (). ['Wang has bought 60,000 yuan of national bonds. If he buys corporate bonds, he can earn 6,000 yuan a year.', 'Lee converted his own idle house into a store, and lost 50,000 yuan in rent income in one year.', 'Zhang has a salary of 30,000 yuan, and then resigned to grow flowers for sale at home.', 'Zhao inspected whether a project can be invested, spent 40,000 yuan, and then abandoned the investment.']