Utilizing the information about After$-$Tax Savings Rate of Return in the "Figure It Out!" Box on page $122$ in textbook, answer the following questions: $[$Make sure to show your work$]$

a$.$ Oscar earned $3\%$ in his savings account. If he is in the $12\%$ tax bracket, what is his after$-$tax savings rate of return?

b$.$ What would be the after$-$tax value of $$100$ earned in interest for Oscar who is in the $12\%$ tax bracket?