On December 31, 2015 Dean Company changed its method of accounting for inventory from weighted average cost

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Question:

On December 31, 2015 Dean Company changed its method of accounting for inventory from weighted average cost method to the FIFO method. This change caused the 2015 beginning inventory to increase by $840,000. The cumulative effect of this accounting change to be reported for the year ended 12/31/15, assuming a 40% tax rate, is
a. $840,000.
b. $504,000.
c. $336,000.
d. $0.