An asset was purchased for 750,000. It had an estimated residual value of 150,000 and an estimated useful life of 10 years. After 5 years of use, the estimated residual value is revised to 120,000 and the estimated useful life is 11 years. Assuming straight-line depreciation, depreciation expense in year 6 would be a. 90,000. b. 66,000 c. 45,000. d. 55,000