[The following information applies to the questions displayed below.] Brooks Company purchases debt investments as trading securities at a cost of $69,000 on December 27. This is its first and only purchase of such securities. At December 31 , these securities had a fair value of $86,000. Brooks sells a portion of its trading securities (costing $34,500 ) for $38,750 cash. Analyze each transaction above by showing its ffects on the accounting equation-specifically, identify the accounts and amounts (including + or -) for each transaction. f $69,000 on December 27 . This is its d a fair value of $86,000 nalyze each transaction above by showing its (including + or - ) for each transaction