Second Thought Products (STP) began operations on January 1, 2015, and adopted the FIFO method of inventory valuation at that time. Management elected to change its inventory method to the average- cost method effective January 1, 2018. The new method more fairly presents the company€™s financial position and results of operations. The following information is available for the years ended December 31, 2015, through December 31, 2018. STP is subject to a 40% income tax rate. The company still uses the FIFO method for income tax reporting.

Required
a. Compute the cumulative effect, net of tax, for the three-year period needed to record a change from the FIFO method to the average-cost method.
b. Prepare the journal entry to record the change in accounting for inventory valuation.
c. Indicate where STP should report the net of tax cumulative effect, assuming that the first balance sheet presented is for the year ended December 31, 2018.
d. Indicate the cost of goods sold reported on the income statement for 2015, 2016, 2017, and 2018.
e. Assume that this change in principle is considered to be impractical. Indicate the cost of goods on the income statement for 2015, 2016, 2017, and 2018.

Cost of Goods Sold Under Average-Cost Year 2015 2016 2017 2018 Method $176,400 117,600 252,000 285,600 FIFO Method $201,600 134,400 277 200 260,400