And the way we do it is we have to remember from algebra what the base conversion formula is for logs. In other words, this is a formula that basically tells us we can convert any log of any base of any inside to the base of ten. So the way we do it is log of base X of Y is equal to log of base ten of y divided by log of base ten of X. Now, in our case, we have a natural log of some Y. And that's equivalent to saying log of base e of Y equals. That means we have to divide log of base ten of Y divided by log of base ten of E. So this is exactly what we follow in this process here.