On January 2 2018, Motors Inc. purchased an engine with a cost of $65,000. At the time, it was expected to last 5 years, with a residual valuevalue of $1,000. Two years later, on January 2, 2020 a new part was added to the engine, to increase its productivity. The new part has a cost of $17,000. Motors Inc. revised theit estimates to extend the expected useful life of the engine to 7 years, and the estimated residual value to $2,000. The revised amortization expense staring January 2020, would be: O A $38.400 OB. $26,600 OC. $12,800 OD. $8,120