Depreciation help!!!

The Dude (Specialist- Finance) (303 Points)

03 April 2009  

Can any one plase tell me the formula of sum of years method of depreciation?

Please help me solve this problem

Original cost: Rs 126000

Salvage Value: Rs 6000

Useful life : 6 years

hat will be the book value of the asset at the beginning of the 4th yr (Sum of Digit method)

A.  Rs 103143

B.  Rs 40286

C.  Rs 45987

D.  Rs 99256

The answer given is B

Please help.