CREATE TABLE table_name_39 (investment_income VARCHAR(255), other_social_security_benefits VARCHAR(255), occupational_pensions VARCHAR(255), working_tax_credit VARCHAR(255))
Occupational pensions of 7%, and a Working tax credit of 2%, and a Other social security benefits of 6% has what investment income?
    
SQL: SELECT investment_income FROM table_name_39 WHERE occupational_pensions = "7%" AND working_tax_credit = "2%" AND other_social_security_benefits = "6%"