Based on the information given his after-tax savings rate of return is 5.62%.
Using this formula
After-tax savings rate=Saving rate of return×(1-Tax rate)
Where:
Saving rate of return=7.2%
Tax rate=22%
Let plug in the formula
After-tax savings rate=0.072×0.78
After-tax savings rate=0.05616×100
After-tax savings rate=5.62% (Approximately)
Inconclusion his after-tax savings rate of return is 5.62%.
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