Calculation of Dividend per Share and Retention Ratio

"a) A for-profit hospital earns a gross profit of $10 million. Twenty-five percent (25%) of this gross profit is retained earnings and another 30% is charged to corporate tax. If there are two 25% preferred shareholders and ten 10% ordinary shareholders, how much will each shareholder earn as dividend? b) If each preferred shareholder pays an income tax of 33.33% on their dividend income, what will be their net dividend earning? c) What is the retention ratio? "