You would like to exchange 1000 for dollars. What is the maximum amount of dollars you can get if you are faced with the following bid-ask exchange rates (please, round your answer to the nearest cent):

$/: 1.35-1.37

$/: 1.48-1.49

/: 1.09-1.11

Answer:_________$1480________________

There already have the answer, but my question is why we choose 1.48? It looks if we choose 1.49 can get more money? But I know my idea is wrong, hope you could give me an explanation. Thank you