please solve all questions. im checking to see if my own work is correct

2. You want to short 200 shares at 80$ per share. Your broker has 50% initial margin and 40% maintenance margin 1. please show initial balance sheet. 2.if the stock price fall to 70$ per share, the margin? Show balance sheet 3 if the stock price rise to 100$ per share, the margin? Show balance sheet. 4.at what price would you subject to a margin call