You are given the following information for Smashville, Inc.

Cost of goods sold:	$	184,000
Investment income:	$	1,600
Net sales:	$	387,000
Operating expense:	$	88,000
Interest expense:	$	7,400
Dividends:	$	6,000
Tax rate:		30	%

Current liabilities:	$	12,000
Cash:	$	21,000
Long-term debt:	$	32,000
Other assets:	$	40,000
Fixed assets:	$	125,000
Other liabilities:	$	5,000
Investments:	$	36,000
Operating assets:	$	64,000

Calculate the gross margin, the operating margin, return on assets, and return on equity.