Its updated bank balance sheet in the first year of business operations is presented below. The fixed-rate mortgages on the balance sheet are with maturity T=5 years, par (face) value of $40, and 14% interest (annual). Any principals are paid fully at maturity T. The time deposits are with maturity T=2 years, par (face) value of $165, and earn 6% per annum to deposit holders. a) Estimate the duration of the 5-year mortgage portfolio. b) Estimate the duration of the 2-year time deposits. c) Estimate the duration of the bank's assets if the following information is also available: duration of Government Securities and Floating-rate loans (each) is 0.85