An equipment has been purchased for Rs.120 and is estimated to have 10 years life and a scrap value of Rs. 20/- at the end of life. The book value of the equipment at the end of sixth year then the interest rate is 5% (using declining balance methods) will be
(a) Rs. 40.95 (b) Rs. 51.25
(c) Rs. 55.00 (d) Rs. 59.25