You recently short sold $500$ shares of Bekkersdahl stock at $$75$ per share. The initial margin requirement $($IMR$)$ is $50$ percent and the maintenance margin requirement $($MMR$)$ is $30$ percent.a$)$ If you hold the stock for $192$ days and at the end of that time the price is $$81$ per share, what is your return on investment? $(10$ pts$)$b$)$ What share price would trigger a margin call? $(5$ pts$)$