need this answered in 1 hour or less for timed exam

(TCO F) In each of the following independent cases, it is assumed that the corporation has $400,000 of 6% preferred stock and $1,600,000 of common stock outstanding, each having a par value of $10. No dividends have been declared for 2009 and 2010.
(a) As of 12/31/11, it is desired to distribute $250,000 in dividends. How much will the preferred stockholders receive if their stock is cumulative and nonparticipating?
(b) As of 12/31/11, it is desired to distribute $400,000 in dividends. How much will the preferred stockholders receive if their stock is cumulative and participating up to 11% in total?
(c) On 12/31/11, the preferred stockholders received a $120,000 dividend on their stock, which is cumulative and fully participating. How much money was distributed in total for dividends during 2011? (Points : 30)