A Seven-Year Municipal Bond Yields 4

A seven-year municipal bond yields 4.8 percent. Your marginal tax rate (including state and federal taxes) is 28 percent. What interest rate on a seven-year corporate bond of equal risk would provide you with the same after-tax return?

A) 3.46%
B) 4.80%
C) 6.14%
D) 6.67%
E) 17.14%