need to learn how to solve using nominal rate, pure rate, inflation rate, risk premium

vestors 15, (After-tax yields) Your income puts you in the 28% federal tax bracket, and as resident of Illinois, in the 4% state tax bracket. What after-tax yield would you receive on: a. An ExxonMobil Corporation bond yielding 10%? b. A U.S. Treasury bond yielding 5%? C. A State of New Jersey bond yielding 4%? d, A State of Illinois bond yielding 4%? ate of n pre- st in a