Average Common Stockholders' Equity, Return on Stockholders' Equity Rebert Inc. showed the following balances for last year: January 1 December 31 Stockholders' equity: Preferred stock, $100 par, 8% $ 4,000,000 $ 4,000,000 Common stock, $3 par 3,000,000 3,000,000 Additional paid-in capital* 4,800,000 4,800,000 Retained earnings 4,000,000 4,250,000 Total stockholders' equity $15,800,000 $16,050,000 * For common stock only. Rebert's net income for last year was $3,182,000. Required: 1. Calculate the average common stockholders' equity. $ 2. Calculate the return on stockholders' equity. %