Cost on January 1 2016 = $1,250,000
Life = 10 years
Therefore,
Double-declining depreciation rate = 2*(1,250,000/10)/1,250,000 = 2*0.1 = 2*10% = 20%
Book value at end of 2016 = 1,250,000 - (1,250,000*20/100) = $1,000,000
Book value at end of 2017 = 1,000,000 - (1,000,000*20/100) = $800,000
Book value at end of 2018 = 800,000 - (800,000*20/100) = $640,000
Changing to straight line depreciation:
Life remaining = 7 years
Book value = $640,000
Depreciation expense per year = 640,000/7 = $91,428.57
Therefore, depreciation expense for 2019 = $91,428.57