An annuity depreciation problem!

Nasir (Student CA CPT ) (47 Points)

28 October 2013  

Hi All, 

Kindly help me in an Annuity Depreciation problem:

Example:

Product purchased for Rs.20,000/-. It has to be depreciated in 4 years @ 5% P.A. using the annuity method. 

I have the answer but NOT the formula to arrive at it! 

Can someone please give me an elaborate example / step by step formula?

:))

Nash.