Taryn Arsenault is a regular commodities speculator. She is currently considering a short position in July oats, which are now trading at $280.$ Her analysis suggests that July oats should be trading at about $271$ in a couple of months. Assuming that her expectations hold up$,$ what kind of return on invested capital will she make if she shorts $3$ July oats contracts $($each contract covers $5,000$ bushels of oats$)$ by depositing an initial margin of $$594$ per contract?

Her return on invested capital is $\%.($Round to two decimal places.$)$