The exchange rates on the following table from the Wall Street Journal are quoted in US dollars for Friday $(3/29)$ and Thursday $(3/28).$

$(1)$ Why is the exchange rate between the U$.$S$.$ and Ecuador constant at $1?$

$(2)$ Compared with Thursday, had the Mexico peso appreciated or depreciated against the U$.$S$.$ dollar on last Friday?

$(3)$ If you placed an order of Japanese products last Friday in the amount of $20$ million Japanese yen. How much will you have to pay in U$.$S$.$ dollar?

$(4)$ Calculate the cross rate of Japan yen per China yuan, E yen$/$yuan$.$

$(5)$ For the same amount of order as in $(3),$ how much will you need to pay in China yuan?$(15\%)$ The exchange rates on the following table from the Wall Street Journal are quoted in US

dollars for Friday $(3/29)$ and Thursday $(3/28).$

$(1)$ Why is the exchange rate between the U$.$S$.$ and Ecuador constant at $1?$

$(2)$ Compared with Thursday, had the Mexico peso appreciated or depreciated against the U$.$S$.$

dollar on last Friday?

$(3)$ If you placed an order of Japanese products last Friday in the amount of $20$ million Japanese

yen. How much will you have to pay in U$.$S$.$ dollar?

$(4)$ Calculate the cross rate of Japan yen per China yuan, E$|$yen$/$yuan$.$

$(5)$ For the same amount of order as in $(3),$ how much will you need to pay in China yuan?

Exchange Rates

U$.$S$.-$dollar foreign$-$exchange rates in late New York trading