Answer:
1) 30,000 shares issued 
2) Common stock average price: 12.1 dollars
    book value: $ 22.49
3)  135,000 dividends to common stockholders
Explanation:
1) preferred stock equity $ 3,000,000 / $ 100 par value = 30,000 shares issued
2) 
common stock: 400,000 issued x $10 face value : 4,000,000
additional paid-in in excess of par value:                    840,000
                                                 total paid-in                4,840,000
average common stock price: $ 4,840,000/400,000 shares = 12.1 
on average common stock were issued at 12.1 dollars
common stock book value: 
(common stock + retained earnings - preferred stock)/outstanding shares
(4,840,000 + 4,260,000 - 105,000)/ 400,000 = 22.4875
3) if 450,000 dividends are distributed:
the compamy will first pay the preferred stocks:
30,000 x $ 100 x 7% =  210,000
dividends in arrears:     105,000
  total preferred stock   315,000
bond to common stock:
450,000 declared - 315,000 preferred stock: 135,000 for common stock