CREATE TABLE table_38691 ("Career Card" TEXT, "Starting career/salary" TEXT, "2nd career/salary" TEXT, "3rd career/salary" TEXT, "4th career/salary" TEXT, "5th career/salary" TEXT, "6th career/salary" TEXT)

2nd career/salary of substitute teacher ($20,000) involves what 6th career/salary?
SELECT "6th career/salary" FROM table_38691 WHERE "2nd career/salary" = 'substitute teacher ($20,000)'
SELECT "6th career/salary" FROM "table_38691" WHERE "2nd career/salary" = 'substitute teacher ($20,000)'