Question B2 (7 marks) The following is an abstract from the working papers of the Tests of Controls - Billing Function and Recording of Sales for the Year End: 31/12/2021 Pop. Size: 145,853 Define the objectives: Examine duplicate sales invoices and related documents to determine if the system has functioned as intended and as described in the audit program. Define the population precisely (including stratification, if any): POS invoices and credit sales invoices for the period 1/1/2021 to 31/12/2021. First invoice number =140672. Last POS number = 283294. First credit sales invoice number = 3600. Last credit sales invoice number = 6531. Define the sampling unit, organization of population items, and random selection procedures: Sales invoice number, POS invoice numbers and credit recorded in the sales files sequentially; random sampling. Description of Attributes Planned Audit EPER TER ARO 1. Bulk order form details match invoice details 0 4 5 2. Warehouse copy of bulk order form has 5 5 customer signature 3. Customer signature on warehouse copy of 5 5 bulk order form matches signature on invoice Required a) What is the initial sample size of each of the attributes? (0.5 mark each, total 1.5 marks) b) Using the number of exceptions of each of the attributes given below, find the computed upper error rate (CUER) (0.5 mark each, total 1.5 marks) c) For each of the attribute (control), is it operating effectively throughout the period under audit. State Yes or No and explain why? (1 mark each, total 3 marks) d) What is your assessment of the control risk of the Billing Function and Recording of Sales for the Year End: 31/12/2021? (1 mark) Use the following table format to complete your answer: Actual Results Control Initial operating Description of Attributes Sample Number of effectively or Exceptions CUER Size not (Yes/NO)? and explain why? 1. Bulk order form details match Invoice details 0 2. Warehouse copy of bulk order 0 form has customer signature 3. Customer signature on warehouse copy of bulk order form matches 2 signature on invoice