A bond amortization schedule is as follows: Annual Interest Period Cash Interest Paid Bond Interest Expense Discount Unamortized Discount Carrying Amount Amortization 0 (Jan. 1, 2020) 114,705.00 885,295.00 1 (Dec. 31, 2020) 50,000.00 53,117.70 3117.70 111,587.30 888,412.70 2 (Dec. 31, 2021) 50,000.00 53,304.76 3,304.76 108, 282.54 891,717.46 1. What is the contractual interest rate for this bond issue? 2. What is the market interest rate for this bond issue? 3. Why the "Cash interest paid" is different from "Bonds interest expense". The difference is because? 4. Why the "Bond interest expense" is decreasing period by period? 5. Please estimate the final balance of "Unamortized discount" and "Carrying amount" in the end of the bond's life.