Can some please explain. I don't know how to get to the answer and why is it overstatement

Multiple Choice Question 57 Your answer is correct. Crane Company's December 31 year-end financial statements contained the following errors: Ending inventory Depreciation expense Dec. 31, 2017 $39500 understated 11200 understated Dec. 31, 2018 $48000 overstated An insurance premium of $76500 was prepaid in 2017 covering the years 2017, 2018, and 2019. The prepayment was recorded with a debit to insurance expense. In addition, on December 31, 2018, fully depreciated machinery was sold for $34500 cash, but the sale was not recorded until 2019. There were no other errors during 2018 or 2019 and no corrections have been made for any of the errors. Ignore income tax considerations. What is the total net effect of the errors on Crane's 2018 net income? Net income understated by $68000. Net income overstated by $78500. Net income overstated by $39500. Net income overstated by $59200