At December 31, 2021, the trading investments for Richetti Inc. are as follows: Security A B Cost $19,900 11,600 21,200 $52,700 Fair Value $22,500 13,100 19,100 $54,700 Totals (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