$9.$ Tim bought $200$ shares of GE stock at $$75/$share on margin, $60\%$ of the costs was his own cash deposit and the other $40\%$ was borrowed from the broker. The broker charges $5\%$ APR interest on the loan, and requires a $25\%$ maintenance margin. Tim held the stocks for more than one year.

$1)$ If the stocks are sold at $$85$ per share after the year, what will be Tim's return rate on his own money after paying back the margin loan? $(6$ points$)$

$2)$ Suppose the stock price will drop after the year. At what stock price then would the investor get a margin call because of the $25\%$ maintenance margin? $(7$ points$)$