CREATE TABLE table_name_20 (working_tax_credit VARCHAR(255), occupational_pensions VARCHAR(255), employment___salaries_ VARCHAR(255), _wages_ VARCHAR(255))
Employment ( salaries & wages) of 64%, and a Occupational pensions of 6% has what working tax credit?
    
SQL: SELECT working_tax_credit FROM table_name_20 WHERE employment___salaries_ & _wages_ = "64%" AND occupational_pensions = "6%"