user: Question: 2nd career/salary of Substitute Teacher ($20,000) involves what 6th career/salary?
Columns: ['Career Card', 'Starting career/salary', '2nd career/salary', '3rd career/salary', '4th career/salary', '5th career/salary', '6th career/salary']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Acting', 'Movie Extra ($5,000)', 'Understudy ($18,000)', 'Stage Actor ($35,000)', 'TV Actor ($80,000)', 'Movie Actor ($500,000-Chance)', 'Movie Director ($1,000,000-Chance)']
SQL:

assistant: SELECT "6th career/salary" FROM "Table" WHERE "2nd career/salary" = 'Substitute Teacher ($20,000)';