Able Towing Company purchased a tow truck for $60,000 on January 1, 2015. It was originaly depreciated ona straight-line basis over 10 years with an estimated salvage value of $12,000. On December 31, 2017, before adjusting entries had been made, the company decided to change the remaining estimated life to 4 more years as of January 1, 2017, and the salvage value was adjusted to $2,000. How much is depreciation expense for 2017? O M,800 O 6,000 O s15.000 O $12,100