Equipment was purchased on January 2, 2007, for $18,000, but no portion of the cost has been charged to deprecia- tion. The corporation wishes to use the straight-line method for these assets, which have been estimated to have a life of 10 years and no salvage value. What effect does this error have on net income in 2007. What entry is necessary to correct for this error, assuming that the books are not closed for 2007?