Answer:
$183,600
Explanation:
Since the expected useful life of the patent is only 10 years, instead of 20 years, its cost should be amortized in 10 years. That means that for every year that passes, Northern has to amortize $20,400 (= $204,000 / 10). Only one year passed between September 30, 2019 and October 1, 2018, so the patent's account on the balance sheet is $183,600 (= $204,000 - $20,400).