do you know/remember how to do logarithms? (logs)
That 500 should be a 50 as pickslides notes. 5000 divided by 100 is 50 not 500
We will take the log of both sides. There are special log rules that you need to remember. Logs were "invented" for dealing with these exact kinds of problems
One of those important log rules is that you can bring down the exponent
now can you solve?