Answer:
$22000 and $50000.
Step-by-step explanation:
Given: Purchased value of equipment- $72000.
Residual value- $6000
Estimated useful life of equipment- $ 5 years.
Now, finding value of depreciation for 2011 using the sum of the years digits method.
Depreciation cost=

⇒ Depreciation cost=

∴ Depreciation cost= $66000.
Depreciation fraction for 1st year=

Depreciation expense for 1st year=

∴ Depreciation for 2011 is $22000.
Next, lets find out the book value at the end of first year.
Book value=

Book value=

∴ Book value at December 2011 is $50000.