Z Ltd. issued 5,000, 12% Debentures of Rs 100 each at a discount of 4% on 1st April, 2016. The debentures were repayable by annual drawings of Rs 1,00,000 starting on 31st March, 2018. Calculate the Amount of Discount to be written off each year and also prepare Discount on Debentures Account in the banks of the company.