please show steps to calculations

As a wheat futures trader, you observe the following futures prices for the purchase and sale of wheat in 3 months: $3.00 per bushel in Chicago and $320 per bushel in Tokyo. Delivery on the contracts is in Chicago and Tokyo, respectively. If the 3-month forward exchange rate is V102/S, what is the magnitude of the transaction cost necessary to make this situation not represent an unexploited profit opportunity