T-bill rate calculation

Assume that a $1000 Treasury bill is quoted to pay 6% interest over four months to maturity.
 

How much interest would the investor receive
What should be the price of the T-Bill
What will be the effective yield
 

An investor is in 34% marginal tax bracket. She can purchase a municipal bond paying 7.25%. She also has the option to purchase a nonmunicipal bond. For the non-muni what would the before tax return need to be to equate the two?
 

On Monday, a 9-year bond sold for $1000 with an 8% coupon rate. On Tuesday the rates in the marketplace were 10%. Interest is paid semiannually. What would be the new price of the bond (Can use the full 9 years)
 

11% coupon rate bond
Price is $943.50
$1000 par value bond
10 years left to maturity
What is the yield to maturity? 

 How much interest would the investor receive