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The answer & explanation for this question is given in the attachment below.

There is no arbitrage opportunity if the forward price is between $1317.695 and $1325 per ounce.
Assuming that F0 is the one-year forward price of the commodity. When F0 is high, the trader can borrow $1250 at 6%, buy one ounce of the commodity and then enter into a forward contract to sell it in one year for F0.
The profit that will be made in one year is F0 = 1250 x 1.06 = 1325
This will be profitable if F0 > 1325. The profit relative to the position the trader would be in if the commodity were held in the portfolio during the year will be 1249 x 1.055 - F0 = 1317.695 - F0
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