Mrs$.$ Yue, a resident of Virginia, paid $$50,000$ for a bond issued by Pennsylvania that paid $$3,400$ interest this year. Her marginal state income tax rate is $6$ percent. Under Virginia law, interest on debt obligations issued by another state is taxable. Mrs$.$ Yue can deduct her state income tax on her Form $1040,$ and her marginal federal income tax rate is $24$ percent. Compute her after$-$tax rate of return on the bond.