E 2. You purchased 50 shares of stock at $20 per share for cash. Assume the stock price rises to $22 per share, calculate your return on investment. 3. You believe ABC Petroleum shares are overpriced. The stock is selling for $45 and you short 100 shares. If the stock price decreases to $40 per share and you close out the transaction, calculate your dollar gain or loss. 4. Heidi wants to contribute $50,000 to her grandson's college fund in 6 years. If she chooses an investment paying 7%, how much does she need to invest today to reach her goal