Answer:Book value at December 31, 2021 =$32,400
Step-by-step explanation:
using double declining balance method
Depreciation expense = 2×Straight-line depreciation percent ×Book value
Given value of machine = $54,000
Residual value = $8,400
Expected life = 5 years
But
straight line depreciation percent = 100% /5years = 20%
Depreciation expense = 2×Straight-line depreciation percent ×Book value
= 2*20% x$54,000 = 40% x $54,000=$21,600
or
Depreciation expense by double declining = depreciation rate x cost of equipment
but depreciation rate = 1/estimated useful life x 2= 1/5 x 2= 2/5 x100% =40%
= 40% x $54,000= $21,600
Book value at December 31, 2021, = Purchase cost - depreciation expense
=$54,000 - $21,600=$32,400