The balance sheets at the end of each of the first two years of operations indicate the following: ? Year 2 Year 1 Total current assets $600,000 $560,000 Total investments 60,000 40,000 Total property, plant, and equipment 900,000 700,000 Total current liabilities 125,000 65,000 Total long-term liabilities 350,000 250,000 Preferred 9% stock, $100 par 100,000 100,000 Common stock, $10 par 600,000 600,000 Paid-in capital in excess of parCommon stock 75,000 75,000 Retained earnings 310,000 210,000 ? ? If net income is $150,000 and interest expense is $20,000 for Year 2, what is the rate earned on stockholders' equity for Year 2? a. 14.5% b. 6.9% c. 13.8% d. 16.04%