BEGIN 
  FOR social_benefits IN
    (SELECT wk_ends, forty_hr_wks, ot_pay
     FROM   bus_practices)
  LOOP
    -- put whatever processing you want here
    -- referencing columns with the same names
    -- that you would in your original code:
    --   social_benefits.wk_ends
    --   social_benefits.forty_hr_wks
    --   social_benefits.ot_pay
  END LOOP;
END;
/