Final answer:
The amount in the deferred tax asset account at December 31, Year 1 is $28,000.
Step-by-step explanation:
The amount in the deferred tax asset account at December 31, Year 1 can be calculated by multiplying the timing differences in Year 2 and Year 3 by their respective enacted tax rates and then summing them up. In this case, the timing differences are $40,000 in Year 2 and $60,000 in Year 3, and the enacted tax rates are 25% and 30% respectively. So, the amount in the deferred tax asset account is:
($40,000 * 0.25) + ($60,000 * 0.30) = $10,000 + $18,000 = $28,000
Therefore, the correct answer is $28,000.