On January 7, 2009, Yoder Corporation acquired machinery at a cost of $1,200,000. Yoder adopted the sum-of-the-years'-digits method of depreciation for this machine and had been recording depreciation over an estimated life of five years, with no residual value. At the beginning of 2011, a decision was made to change to the straight-line method of depreciation for this machine. Assuming a 30% tax rate, the cumulative effect of this accounting change, net of tax, is:
a. $0
b. $160,000
c. $168,000
d. $240,000