Marginal tax rates$$ Using the tax rate schedule given here LOADING...$,$ perform the$$ following:

a$.$ Find the marginal tax rate for the following levels of sole proprietorship earnings before$$ taxes: $ $15$ comma $900$; $ $60$ comma $800$; $ $89$ comma $300$; $ $150$ comma $000$; $ $237$ comma $000$; $ $452$ comma $200$; and $ $1$ million.

b$.$ Plot the marginal tax rates$($measured on the $$y$-$axis$)$ against the pretax income levels$($measured on the $$x$-$axis$).$

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Part $1$

a$.$ The marginal tax rate for earnings before taxes of $ $15$ comma $900$ is

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enter your response here$\%.($Round to the nearest$$ integer.$)$