The company started business in 2013. In 2015, the company decided to change its method of computing oil and gas exploration expense. The company has only two expenses: oil and gas exploration expense and income tax expense. The following sales and oil and gas exploration expense information are for 2013-2015:

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2015 2014 2013 Sales Oil and gas exploration expense-old method. Oil and gas exploration expense-new method. $5,000 3,000 2,000 400 1,500 1,000 700 600 1,200