A mainframe computer whose cost is ₹5,00,000 will depreciate to a scrap value of ₹50,000 in 5 years. By using linear method of depreciation, the book value of the computer at the end of third year is :

₹90,000 ₹1,20,000 ₹1,80,000 ₹2,30,000

₹2,30,000