Answer:
Estes must adjust the Securities Fair Value Adjustment account (which is a contra asset account) by debiting $17,500 (= $475,000 - $492,500). Since the investment in trading securities is considered an asset but it had lost value, an unrealized loss of $25,000 was reported in its 2017 balance. Since the investment's value has increased, the unrealized loss has to decrease. This is done by crediting an unrealized gain of $17,500 in the Unrealized Gains account (equity account).
