Suppose the U$.$S$.$ dollar is defined by law to be equal to $0\mathrm{.}1$ ounce of gold.

Further suppose that the euro is defined by law to be equal to $0\mathrm{.}05$ ounce of gold. The exchange rate between the dollar and the euro should be:

$$1=2$ euros

@ $1$euro $=$ $$2$

$$$$1=1$ euro

There is not enough information to answer this question