Please help me with this Accounting Question

1)On 1st January, 2000 Shakti & Co. purchases machinery worth Rs. 50,000. On 1st July, 2002, it
buys additional machinery worth Rs. 10,000 and spends Rs. 1,000 on its erection. The accounts
are closed each year on 31st December. Assuming the annual depreciation to be 10% show the
machinery account for 5 years under
(1) Straight Line Method
(2) Diminishing Balance Method

2)Neha & company whose accounting year is the calendar year, purchased on 1st April, 2006
machinery costing Rs. 30,000. It purchased further machinery on 1st October, 2006 costing
Rs. 20,000 and on 1st July, 2007 costing Rs. 10,000.
On 1st January, 2008, one third of the machinery which was installed on 1st April, 2006
became obsolete and was sold for Rs. 3,000. Show how the machinery account would appear
in the books of Neha & company, assuming that machinery was depreciated by fixed installment
at 10% p.a

3)On 1.1.2008 one-third of the machinery which was purchased on 1.4.2006 became obsolete and was sold for Rs. 6,000. The machinery was to be depreciated by Fixed Instalment Method at
10% p a.