The following income statement is provided for Ramirez Company in 2013:

Sales revenue (3,200 units $20.70 per unit)	$66,240
Cost of goods sold (variable; 3,200 units $8.70 per unit)	(27,840)
Cost of goods sold (fixed)	(4,700)
Gross margin	33,700
Administrative salaries	(6,700)
Depreciation	(4,700)
Supplies (3,200 units $2.70 per unit)	(8,640)
Net income	$13,660

What amount was the company's contribution margin? (Do not round intermediate calculations.)

$29,760

$13,660

$33,700

$38,400