On the day you arrive in New Zealand, the exchange rate for U.S. dollars and New Zealand

Question:

On the day you arrive in New Zealand, the exchange rate for U.S. dollars and New Zealand dollars is $1:2.25 NZ$. While you remain in New Zealand for the next few months, the exchange rate falls to $1:$1.75439 NZ$. When you entered New Zealand, you converted US$10,500 to NZ$. As you leave New Zealand, you have NZ$ 400. How much did you spend in New Zealand in U.S. dollars? Did the movement in the exchange rate help or hurt you?

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...