Consider a U.S. municipal bond (tax-exempt) with 30 years left to maturity and paying 8 percent coupon. The bond is currently priced at $980. Find the after-tax yield to maturity for an investor with a 25 percent marginal tax rate. Make sure to express your answers as a percentage. Make sure to round your answers to the nearest 100th decimal points. For example, write 9.43 for 9.43%.