The company purchased a fleet of mowers for $$500,000$ and they estimated the

residual value to be $$70,000$ at the end of the estimated service life of $10$ years.

For Straight$-$line depreciation method:

Determine Book value at the end of year $3$

For Double declining balance depreciation method:

Determine depreciation expense for year $2$$

Determine depreciation expense for year $3$$

For Activity based depreciation method:

Management estimated the machine's service life would be $344,000$ hours;

following is the activity for the first $3$ years:

Determine depreciation expense for year $3$$

Determine Book value at the end of year $3$$