Mathias Co. sells cars, car parts, and gasoline from 25 different locations in one country. Each branch has up to 20 staff working there, although most of the accounting systems are designed and implemented from the company's head office. All accounting systems, apart from petty cash, are computerized, with the internal audit department frequently advising and implementing controls within those systems.

Mathias has an internal audit department of six staff, all of whom have been employed at Mathias for a minimum of five years and some for as long as 15 years. In the past, the chief internal auditor appointed staff within the internal audit department, although the chief executive officer is responsible for appointing the chief internal auditor. The chief internal auditor reports directly to the chief financial officer (CFO). The CFO also assists the chief internal auditor in deciding on the scope of work of the internal audit department.

You are an audit manager in the internal audit department of Mathias. You are currently auditing the petty cash systems at the different branches. Your initial systems notes on petty cash contain the following information:

1. The average petty cash balance at each branch is $5,000.

2. Average monthly expenditure is $1,538, with amounts ranging from $1 to $500.

3. Petty cash is kept in a lock box in a locked filing cabinet in the accounts office.

4. Vouchers for expenditures are signed by the person incurring that expenditure to confirm they have received reimbursement from petty cash.

5. The pre-numbered vouchers are recorded in the petty cash book by the accounting clerk; each voucher records the date, reason for the expenditure, amount of the expenditure, and person incurring that expenditure.

6. Petty cash is counted every month by the accounting clerk, who is in charge of the cash. The pettycash balance is then reimbursed using an imprest system and the journal entry produced to record expenditure in the general ledger.

7. The cheque to reimburse petty cash is signed by the accountant at the branch at the same time as thejournal entry to the general ledger is reviewed.

Which of the following are weaknesses in the petty cash system for Mathias?

Petty cash vouchers are authorized after expenditure is incurred

Petty cash is kept in a lock box in a locked filing cabinet

Average cash balance is $5,000

Accounting clerk counts the petty cash

The person incurring the expenditure signs the petty cash vouchers

Petty cash vouchers are pre-numbered