Answer:
The journal entries will be as follows:
31 December 2015
Debit: Unrealised loss - equity $9,080
Credit: Fair value (FV) adjustment AFS (Long Term investment - LT) $9,080
31 December 2016
Debit: FV adjustment - AFS (LT) $29,783
Credit: Unrealised loss - equity $9,080
Credit: Unrealised gain - equity $20,703
31 December 2017
Debit: FV adjustment - AFS (LT) $65,174
Credit: Unrealised gain - equity $65,174
31 December 2018
Debit: Unrealised gain - equity $85,877
Debit: Unrealised loss - equity $77,947
Credit: Fair value adjustment - AFS (LT) $163,824
Step-by-step explanation:
31 December 2015: Record FV of securities ($302,680 - $293,600) = $9,080 - FV loss
31 December 2016: Record FV of securities, FV adjustment - AFS (LT) = $345,055 - $365,758 = $20,703 net gain ($9,080 prior year loss + $20,703 current year gain)
31 December 2017: Record FV of securities: FV adjustment - AFS (LT) - $469,275 - $555,152 = $85,877 net gain (current year gain $85,877 - $20,703 prior gain)
31 December 2018: Record FV of securities: FV adjustment - AFS (LT) = $708,605 - $630,658 = $77,947 net loss ($85,877 prior year gain + $77,947 current year loss)