Inferring Useful Lives

The information that follows is from the balance sheet of Hampton Company for December 31, 2008, and December 31, 2007.

 

Dec 31, 2008

Dec 31, 2007

Equipment—cost                                           

$ 680,000

$ 680,000

Accumulated depreciation—equipment                          

(250,000)

(160,000)

Buildings—cost                                             

2,450,000

2,450,000

Accumulated depreciation—buildings                            

(340,000)

(230,000)

Hampton did not acquire or dispose of any buildings or equipment during 2008.Hampton uses the straight line method of depreciation. If residual values are assumed to be 10% of asset cost, what is the average useful life of Hampton’s (1) equipment and (2) buildings?