Answer:
Canadian Dollar has appreciated whereas US Dollar has depreciated.
Explanation:
The July 1 exchange rate,
1 USD = 0.80 CAN $
This means to buy 1 USD, we need 0.80 CAN $. This further means, USD is stronger currency and CAN $ IS weaker.
On Aug 1, the exchange rate is 1 USD = 1 CAN$
This means, now to buy 1 CAN $, one is required to pay 1 USD i.e more USDs than before. This means over the period of one month, the CAN $ has appreciated whereas US Dollar has depreciated over the period.
