Answer: The proper amount of net income as at December 31, 2018 is $58,750.
Explanation: Trojan Corporation adjusted net income for the year ended 31 December 2018 would be as follows:
Net income (unadjusted) - $85,000
a) Adjust for amortization of prepaid insurance of $1,250 per month ($15,000/12 * 3) - (3,750)
b) Reclassify service revenue to unearned revenue (liability) - (2,500)
c) Reclassify supplies expense to supplies (asset) - (2,000)
d) Adjust for interest expense of $550 per month (12% of $55,000 * 4 / 12) - (2,200)
Net income (adjusted) - $58,750