During 20X2, Washington Corporation Made the Following Journal Entry to Record

During 20X2, Washington Corporation made the following journal entry to record the declaration and payment of a cash dividend: $$\begin{array} { | l | r | r | } \hline \text { Retained Earnings (Common Shares) } & 10,000 & \\\hline \text { Retained Earnings (Preferred Shares) } & 3,600 & \\\hline \text { Cash } & & 13,600 \\\hline\end{array}$$ The total values of common and preferred shares outstanding were $70,000 and $40,000, respectively. No dividends were declared or paid during 20X1. There are 1,000 common treasury shares. (a) If the preferred shares are noncumulative, the current dividend rate on the preferred shares was ________%. (b) If the preferred shares are cumulative , the current dividend rate on the preferred shares was ______%.