A company, whose accounting year is the calendar year, purchase on 1st April, 1988, machinery costing Rs. 30,000. It purchased further machinery on 1st October, 1988, costing Rs. 20,000 and on 1st July, 1989, costing Rs. 10,000. On 1st January, 1990, one third of the machinery installed on 1st April, 1988, became obsolete and was sold for Rs. 3,000.

Show how the machinery account would appear in the books of the company, it being given that machinery was depreciated by Diminishing Balance method at 10% per annum. What would be the balance of Machinery account on 1st Jan., 1991?