So, you probably know that the formula for exponential growth is $\displaystyle y=a(1+r)^t$, with $\displaystyle a$ being the original amount, $\displaystyle r$ being the percent of growth, and $\displaystyle t$ being the amount of time. I would like to learn to get $\displaystyle t$ using logarithms.

Hopefully you may be able to help. Thanks in advance!

Gobblewobble123