(Interest Rate risk) Bond S has 4 years to maturity. Bond T has 30 years to maturity. Both have 9% coupons paid semi-annually, and are priced at par value. If the interest rate(yield to maturity) suddenly drops by 3.1%, the percentage change in the price of Bond T is ____________% (Round your answer to a two-decimal number.)
She expects to live for 20 years after she retires at 65. If her investments continue to earn the same rate, how much will she be able to withdraw at the end of each year after retirement? $_________________