Lisa has a margin account and deposits $75,000 into it. Assume that the prevailing margin requirement is 50%, interest and commissions are ignored and and XYZ Corp. is selling for $45 a share. a.) How many shares can Lisa purchase using the maximum allowable margin? b.) What is Lisa's profit or loss is XYZ Corp.'s stock i.) Rises to $52 and Lisa sells the stock? ii.) Falls to $36 a share and sells the stock? c.) If the maintenance margin is 30%, what price can the stock fall to before Lisa receives a margin call?