From the following information compute the income chargeable under the head Interest on Securities for Ms. Veronica for the income year 2016 - 2017: Income from interest on taxexempt government securities Tk. 9,000; 10% tax-exempt government securities to the extent of Tk. 50,000; Income from interest on taxable government securities Tk. 1,800; 10% taxable government securities to the extent of Tk. 25,000; Income from interest on 12% debentures Tk. 18,000; 15% debentures to the extent of Tk. 20,000 and Interest from zero coupon bond Tk. 8,000.