Math questions: logarithms?
1. The population of a city is decreasing at the rate of 0.3% annually. How long does it take to reduce 2% of its population?
2. The stock depreciates x%, and then appreciates 20%. Will you get back your money exactly (i.e., $1 if
you invest $1)? What is the value of x?
I have no idea how to set these problems up. I know we have to use logarithms to solve them. Can someone help me out? Thank you!