Answer:
the exchange rate between U.S. dollar and German mark be under this system will be of 3 U$D = 1 german mark
Explanation:
We will use gold and silver as a mean to equalize both currencies:
<u>First equivalence between silver and gold:</u>
90 francs = 1 ounce of gold
9 franc = 1 ounce of silver
90/9 = 10 ounce of silver equals 1 ounce of gold.
<u>Now, we convert the german mark to gold:</u>
1 german mark = ounce of silver
10 german mark = ounce of gold.
<u>Finally, we equalize with the US dollars:</u>
30 dollar = ounce of gold = 10 german mark
30 dollars = 10 german mark
3 dollars = 1 german mark