Table schema:
CREATE TABLE table_name_20 (working_tax_credit VARCHAR, occupational_pensions VARCHAR, employment___salaries_ VARCHAR, _wages_ VARCHAR)

Question: 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%"