Bond A has a 4% coupon and Bond B has a 9% coupon. Both have yields of 7%, pays semiannually, and 4 years to maturity. What is the percentage change in each bond if yield increases by 2%? A: 6.89%, B: 6.43% A: 6.43%, B: 6.89% A: 6.72%, B: 6.34% A: 6.34%, B: 6.72% None of the above