Answer:
a. Import more bushels of wheat from Mexico
Explanation:
When the real exchange rate is higher than one, a country is likely to import more, since goods are cheaper in the other country than locally. In this example, a bushel of wheat, in the US, costs $6.40, while in Mexico, the same product costs:
[tex]P=40\ pesos *\frac{\$1}{10\ pesos}\\ P=\$4[/tex]
Therefore, the US will Import more bushels of wheat from Mexico.