During every financial year, the value of a machine depreciates by 12%. Find the original cost of a machine which depreciates by Rs. 2,640 during the second financial year of its purchase.
a manufacture estimates that his machine depreciates by 15% of its value at the begning of the year. Find the orignal value (cost) of the machine, it depeiciates by Rs 5,355 during the second year.