At December 31, 2021, the trading investments for Richetti Inc. are as follows: Security Cost Fair Value A $19,900 $22,500 11,600 13,100 C 21,200 19,100 Totals $52,700 $54,700 (a) Prepare the adjusting entry at December 31 to report the trading investment portfolio at fair value. (List all debit entries before credit entries. Credit account titles are automatically indented when the amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter O for the amounts.) Date Account Titles and Explanation Debit Credit Dec. 31