Mills Corporation acquired as an investment $$240$ million of $6\%$ bonds, dated July $1,$ on July $1,2024.$ Company management is holding the bonds in its trading portfolio. The market interest rate $($yield$)$ was $4\%$ for bonds of similar risk and maturity. Mills paid $$280$ million for the bonds. The company will receive interest semiannually on June $30$ and December $31.$ As a result of changing market conditions, the fair value of the bonds at December $31,2024,$ was $$270$ million.

Required:

$1.$ & $2.$ Prepare the journal entry to record Mills$$ investment in the bonds on July $1,2024$ and interest on December $31,2024,$ at the effective $($market$)$ rate.

$3.$ Prepare the journal entry by Mills to record any fair value adjustment necessary for the year ended December $31,2024.$

$4.$ Suppose Moody$$s bond rating agency upgraded the risk rating of the bonds, and Mills decided to sell the investment on January $2,2025,$ for $$290$ million. Prepare the journal entries required on the date of sale.