Let 
and 
.
Find all values of 
so that the domain of 
is all 
.
Definitions:
Spot Rate
The current market price of a commodity, currency, or security that is available for immediate settlement.
Direct Quote
A foreign exchange rate quoted as the domestic currency per unit of the foreign currency.
British Pound
The currency of the United Kingdom, symbolized as GBP.
Forward Exchange Rate
The agreed-upon exchange rate for currencies to be swapped on a specified future date.
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