Answer:
The gain of $18000 would be reported in income statement
Explanation:
At each reporting date, the investment needs to be recorded at fair value to reflect current market prices and realities.
As a result,the fair value increase in investment of $18000 (fair value less costs) would be shown in income statement as unrealized gain on investment since the investment has not been disposed of.
Under IFRS for instance the gain would be shown under other comprehensive in order to emphasis its unrealized nature.