Preferred dividends$$In each case in the following$$ table, how many dollars of preferred dividends per share must be paid to preferred stockholders before common stock dividends are$$ paid?

a$.$ The amount of preferred dividends that must be paid in Case A before common dividends are paid is $$$

$$

b$.$ The amount of preferred dividends that must be paid in Case B before common dividends are paid is $$$ $($Round to the nearest$$ cent.$)$