S. Panya has total assets of $1,000,000; common equity of $400,000; a gross profit of $800,000; total operating expenses of $620,000; interest expense of $20,000; income taxes of $74,000; and preferred dividends of $30,000. What is S. Panya's return on equity?

7.5% 20.0% 21.5% 14.0%