Answer:
$73,170
Step-by-step explanation:
The double declining-balance depreciation method of depreciation is otherwise known as Reducing Balance Method.
Depreciation Expense = 2 × SLDP × BVSLDP
WHERE,
SLDP = 100 ÷ Number of useful life
Therefore,
SLDP = 100 ÷ 20
 = 5 %
Depreciation for 1st year
Depreciation Expense = 2 × 5 % × ($870,000 - $57,000)
 = $81,300
Depreciation for 2nd year
Depreciation Expense = 2 × 5 % × ($870,000 - $57,000 - $81,300)
 = $73,170