Answer:
Juanita's marginal tax rate is 42.5%
Step-by-step explanation:
marginal tax rate = MTR
After tax yield of dividend paying stock is 8.1% * (1-0.15) = 0.069 = 6.9%
The after tax yield of the bond will be 6.9%
Therefore,
6.9% = 12.0% * (1 - MTR)
6.9% = 12.0% - 12.0% *MTR
6.9% - 12.0% = -12.0% * MTR
-0.051 = -0.12*MTR
MTR = 0.051/0.12 = 0.425
MTR = 42.5%