Situation 2:Money exchanges at the bank
Soldier:Excuse me！I want to change 200 US dollars into local currency.
Cashier:Alright，fill in the form and hand me your passport，please.
Soldier:What is today’s exchange rate？
Cashier:The cash purchase rate is 100:521.40.
Soldier:Here it is.
Cashier:Your passport，cash and exchange memo.Please keep them safe！
Soldier:What if I want to convert them back into US dollar？
Cashier:You just come back and all you need is the memo.
Soldier:Anytime？
Cashier:Within six months.
