0.4.10 please explain the solution step by step

10. A state has just adopted the following state in- come tax system: no tax on the rst $10,000 earned, 1% of the next $10,000 earned, 2% 0f the next $20,000 earned, and 3% of all additional earnings. Write a multiline function definition for T(x), the state income tax due on earnings of x dollars