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What is the combined effect on net income of a $$18,000$ understatement error to ending inventory for the two$-$year period if the error is not corrected?

Net income will be overstated by $$18,000.$

Net income will be understated by $$18,000.$

The errors are cumulative and the total net income error will be double.

The errors cancel out and the total net income for the two periods will be correct.