Suppose, the initial margin is 40%, and you are buying 100 shares at $20/ share, a) how much money do you have to have to provide? b) If the price increases to $30, what is the margin now? (Margin refers to the part not borrowed) (Margin =( Current value of securities Amount borrowed ) (Current value of securities)) c) If the maintenance margin is 10%. At what price would you have a margin call