You need to buy 500,000 EURO using VND to pay for an import transaction. Suppose you need to buy the currency from a bank. Do a research on the exchange rates quoted by different banks and select the bank that you will transact with. Provide an explanation to support your decision, in which you should provide a calculation of the amount of VND needed to pay for the exchange transaction if your trade with each bank and a comparison among different banks to select the best one to trade with. You should also provide a screenshot of the banks exchange rates for reference.