Based on the information given, it should be noted that the after tax yield on the bonds will be 7.2%
It should be noted that the after tax yield will be:
= Interest × (1 - tax rate)
= 12 × (1 - 40%)
= 12 × (1 - 0.4)
= 12 × 0.6
= 7.2%
Also, Kim should buy the HCA bonds because their after tax yield is more than that of Twin cities.
Lastly, to make Kim indifferent between these bonds and the HCA bonds, Twin cities bonds should give an interest rate that's equal to 7.2%.
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