Delta Oil Company uses the successful-efforts method to account for oil exploration costs. Delta started business in 2017 and prepared the following income statements:

The company chooses to change to the full-cost method at the beginning of 2019. Under the full-cost method, Delta capitalizes all exploration costs of the Oil and Gas Properties asset account on its balance sheet. It determines the exploration and amortization expense amounts under the full-cost method to be as follows:

In addition, Delta reported revenue of $9,000,000 and other expenses of $4,200,000 in 2019. With the 2019 financial statements, the company issues comparative statements for the previous 2 years.

Required:
1. Prepare the journal entry to reflect the change.
2. Prepare the comparative income statements and the comparative statements of retained earnings for 2019, 2018, and 2017. Notes to the financial statements are not necessary.
3. Next Level Discuss the advantages and disadvantages of accounting for a change in this manner.

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2017 2018 $1,000,000 $3,000,000 Revenue Other expenses 400,000 1,300,000 Exploration expenses Income before income taxes Income tax expense (21%) Net income Earnings per share 120,000 $ 480,000 238,000 $1,462,000 100,800 $ 379,200 307,020 $1,154,980 2$ 2$ 11.55 3.79 2017 2018 2019 Exploration expense Amortization expense 8,000 18,200 42,000