Dana intends to invest $$76,000$ in either a Treasury bond or a corporate bond. The Treasury bond yields $5$ percent before tax, and the corporate bond yields $6$ percent before tax. Assume Dana's federal marginal rate is $24$ percent and she itemizes deductions.

Required:

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a$-1.$ Assuming Dana's marginal state rate is $5$ percent, which of the two options should she choose?

o$-2.$ How much interest after$-$tax would Dana earn by investing in the corporate bond?

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b$-1.$ If she were to move to another state where her marginal state rate would be $10$ percent, which of the two options should she choose?

b$-2.$ How much interest after$-$tax would Dana earn by investing in the corporate bond as per requirement b$-1?$