Situation 1:Money exchanges at the roadside stall
Dealer:Sir，can I help you？
Soldier:Money exchanges.
Dealer:To US dollar or Liberian dollar？
Soldier:Liberian dollar.How about the exchange rate now？
Dealer:50.
Soldier:How about 55？
Dealer:How much would you like to exchange？
Soldier:20 dollars.
Dealer:That’s too little money.Say 52，that’s the ceiling rate.
Soldier:Deal！
Dealer:It is 1040 altogether.Do come again！
