Question: Taryn Arsenault is a regular commodities speculator. She is currently considering a short position in July oats, which are now trading at 248. Her analysis suggests that July oats should be trading at about 240 in a couple of months. Assuming that her expectations hold up, what kind of return on invested capital will she make if she shorts three July oats contracts (each contract covers 5,000 bushels of oats) by depositing an initial margin of $540 per contract?