If I were to cover all 150 contracts out at a price of 104.90 per lb., what is my ROI, both in dollars and percentage?

Investment Management

Having gone short on 150 contracts of the August Lean Hogs at 102.65 per lb.

a) If I were to coverĀ  all 150 contracts out at a price of 104.90 per lb., what is my ROI, both in dollars and percentage?

b) What instructions should I have put in place to ensure that the maximum loss this transaction could have incurred is close to 22%?