CREATE TABLE table_name_39 (investment_income VARCHAR2, other_social_security_benefits VARCHAR2, occupational_pensions VARCHAR2, working_tax_credit VARCHAR2)

Occupational pensions of 7%, and a Working tax credit of 2%, and a Other social security benefits of 6% has what investment income?
SELECT investment_income FROM table_name_39 WHERE occupational_pensions = "7%" AND working_tax_credit = "2%" AND other_social_security_benefits = "6%"
SELECT "investment_income" FROM "table_name_39" WHERE "2%" = "working_tax_credit" AND "6%" = "other_social_security_benefits" AND "7%" = "occupational_pensions"