Claiming the depreciation on pc and laptop.

Divk (designer) (46 Points)

22 July 2014  
I've been filing my IT return for the last 5-6yrs but I forgot to claim depreciation on my desktop PC. Book value of the PC is Rs.25,000.
a) Can I claim depreciation for the year ending 31st March 2014? 
b) If yes, what will be the rate?
 
I purchased a laptop in Jan'14 worth Rs.35,000.
c) Can I claim depreciation for the year ending 31st March'14?
d) If yes, what will be the rate? 
e) If not, then what will be the rate for 1st April'14 to 31st March'15?
 
Thanks!