18. Group tax deducted from employees' wages must be paid to the Internal Revenue Commission: A [ ] Every month B [ ] Every two months C [ ] Quarterly D [ ] Annually 19. A reconciliation of Group tax deducted from employees' wages and the amount paid to the Internal Revenue Commission must be prepared: A [ ] Monthly B [ ] Quarterly C [ ] Half yearly D [ ] Annually 20. Which of the following documents should a buyer receive if less goods are delivered than are listed on the invoice? A [ ] Credit Note B [ ] Goods Returned Slip C [ ] Debit Note D [ ] Cheque