You are given the following information for Smashville, Incorporated.

Cost of goods sold: $ $175,000$

Investment income: $ $2,800$

Net sales: $ $237,000$

Operating expense: $ $42,000$

Interest expense: $ $7,400$

Dividends: $ $10,000$

Tax rate: $21\%$

Current liabilities: $ $18,000$

Cash: $ $21,000$

Long$-$term debt: $ $10,000$

Other assets: $ $36,000$

Fixed assets: $ $89,000$

Other liabilities: $ $5,000$

Investments: $ $12,000$

Operating assets: $ $24,000$

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

Note: Do not round in