If to ship any amount of gold between New York and London costs 1 percent of the

Question:

If to ship any amount of gold between New York and London costs 1 percent of the value of the gold shipped, define the U.S. gold export point or upper limit in the between the dollar and the pound (R = $/£). Why is this so?
Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...