1. A trader shorts 100 shares of stock with initial price per share of $75. The broker requires 150% initial margin, and 125% maintenance margin. How much does the trader need to add for margin over and above the cash proceeds from the short sale to make initial margin? What change in the stock price will cause a margin call?

2. An investor enters into a short position in 1000, 3-month futures contracts. One contract is on 1000 barrels so if not closed, this position requires delivery of one million barrels of crude oil. The initial futures price is $43.50 per barrel. Initial margin is $7000, and maintenance margin is $5250, both per contract. What change in futures price will result in a margin call?