$5.$ You just purchased $550$ shares of Malmok, Inc. stock for $$87$ per share. The initial margin requirement is $50\mathrm{.}0\%.$

a$.$ How much margin must you deposit?

b$.$ How much are you borrowing and what is your Equity?

c$.$ Now suppose the price of the stock falls to $$68$ per share. What is your new margin percentage?

d$.$If the maintenance margin is $50\%,$at what stock price would you get a margin call?