Marginal tax rates Partner A, a single taxpayer, is one of two partners in a small business. As such, she receives pass-through income that is taxed at her personal tax rates. After all adjustments and deductions have been made, including the 20% qualified business income deduction, she is preparing to calculate her taxes owed for the year. Using the tax rate schedule given here

$0 to	$@CNUM{9525}	$0	+	(10%	amount over	$0)
9,525 to	38700	953	+	(12%	amount over	9,525)
38,700 to	82500	4454	+	(22%	amount over	38,700)
82,500 to	157500	14090	+	(24%	amount over	82,500)
157,500 to	200000	32090	+	(32%	amount over	157,500)
200,000 to	500000	45690	+	(35%	amount over	200,000)
500,000 to		150690	+	(37%	amount over	500,000)
			+		amount over

perform the following:

a. Find the marginal tax rate for the following levels of sole proprietorship earnings before taxes:

$15,600; $59,900; $90,000; $153,000; $254,000; $451,000; and $1.3 million.

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

Explain the relationship between these variables.