Consider a 20-year, 8% semi-annual coupon bond selling at 828.41 to give YTM = 10%. What is the duration of the bond? Suppose the interest rate increases from 10% to 10.10%, then what is the approximately price change estimated using duration? What is the actual price change? Is there any difference? Explain. Consider the same 20-year, 8% semi-annual coupon bond selling at 828.41 to give YTM = 10%. Suppose the interest rate increases from 10% to 13%, what is the approximately percentage price change estimated using duration? What is the actual percentage price change? Is there any difference? Explain.