# Growth rates and log-transformation of variables

In my model I include the variables deposits, first at levels but after I transform them to growth rates, using $DGR=\frac{DL_2-DL_1}{DL_1}$. I have also included the exchange rate, which I have log-transformed using logarithm. Is this logic presentation of the variables? What does the log-transformed exchanged rate present? Or should I also log-transform the level of the deposits, instead of using growth rates?