LO $9$ A client prepared the following worksheet listing all activities in the marketable securities accounts for the year under audit. For the purpose of this question, assume there are no unusual securities$.$ Assume also that the audit team assessed control risk as high and that the auditor will use substantive tests of details for the account balance. The account balances at the beginning and end of the year per the company$$s trial balance are:

A table lists a company$$s trial balance. The data is provided as Option: Beginning Balance and Ending Balance. Investment in marketable securities: $400,000$ and $675,000.$ Allowance to reduce securities to market: $35,000$ and $35,000.$ Subtotal: $365,000$ and $640,000.$ Balance per general ledger. Interest income: Not available and $25,000.$ Dividend income: Not available and $18,000.$ Net gain on the disposal of securities: Not available and $32,000.$

Identify the audit procedures needed to complete the audit of marketable securities$.$ Assume that the same audit firm audited the client last year. Be sure to cover the steps the auditor would use to determine that the securities are properly classified.