Exchange rates measured against global benchmark currency

Time = 1

Time = 2

USD/GBC = 1.1023

USD/GBC = 1.0502

GBP/GBC = 1.3667

GBP/GBC = 1.4102

EUR/GBC = 1.1431

EUR/GBC = 1.1316

AUD/GBC = 0.7214

AUD/GBC = 0.7321

Changes in currency value calculated from global benchmark currency exchange rates

$valuechange=\frac{\Delta USD}{GBC}=\left[\frac{1.0500}{1.1000}-1\right]\times \frac{100}{1}=-4.73\text{\%}$

$valuechange=\frac{\Delta GBP}{GBC}=\left[\frac{1.4102}{1.3667}-1\right]\times \frac{100}{1}=3.18\text{\%}$

$valuechange=\frac{\Delta EUR}{GBC}=\left[\frac{1.1316}{1.1431}-1\right]\times \frac{100}{1}=-1.01\text{\%}$

$valuechange=\frac{\Delta AUD}{GBC}=\left[\frac{0.7321}{0.72140}-1\right]\times \frac{100}{1}=1.36\text{\%}$