The modified duration and convexity of a 6%,25 year bond selling to yield 9% is 10.62 and 91.46 respectively. If the required yield increases by 300 basis points from 9% to 12% what is the approximate percentage change in the price of the bond due to: a) duration, b) convexity, c) duration and convexity? d) If the actual change is 26.50%, compare your results from a) and c) which provides a better approximation