Answer
Generally, exchange rates don't change very significantly across 30 day periods.
For instance, on November 12th, 2022, one Canadian dollar was worth .75 USD. On December 11th, 2022, one Canadian dollar was worth .73 USD.
On November 12th, 2022, one Pound Sterling was worth 1.18 USD. On December 11th, 2022, one Pound Sterling was worth 1.22 USD.
Work Step by Step
Answers will vary based on the time period the person is living in. Generally, exchange rates remain relatively stable, but there are instances (in Britain in September of 2022, for example) in which the exchange rate to the US Dollar changed significantly over a 30 day period.