You want to buy industrial ethanol and you have $125USD to spend. The domestic price is $0.50USD per liter. You can also buy ethanol with free shipping from Canada and Mexico.
The price in Canada is $0.54CD and the price in Mexico is 10 pesos per liter.
The spot US-CA exchange rate is $0.90USD and the CA-MX exchange rate is 16?. From what country should you buy your ethanol and how much can you afford to buy?