You are a senior auditor at CPA LLP. This year, your audit client is Burnaby Wholesalers Ltd, a Canadian public listed firm that distributes building materials, hardware, gardening, and related products to retail stores that service the "do-it-yourself" home improvement market. The audit engagement team includes you, one engagement partner, three junior auditors, and two senior auditors. The fiscal year-end under audit is December 31, 2021. Prior to the current fiscal year, Burnaby Wholesalers was audited by another public accounting firm, but the client changed auditors in early June 2021 because management was dissatisfied with the predecessor audit firm's high audit fee and lack of timely service. During the audit of Burnaby Wholesalers, you encounter the following scenarios. Please respond to each scenario and include your discussions in one PDF document.

10. One junior auditor is confused about the degree to which auditors should rely on the internal controls. One of his questions is "which assertion(s) help explain why auditors need to rely on internal controls at some minimal level?" Please explain to him. The junior auditor is also unclear about how the assertion related to fraud detection in CAS 240 is different from other assertions in auditing. Please explain to him (4 marks).