1. Two years ago, you invested $2,500. Today it is worth $2,809. What rate of interest per annum did you earn?

2. Twenty years ago, your mother invested $15,000. Today, that investment is worth $76,681. What is the average annual rate of return she earned on this investment?

3. Twelve years ago, APC Logistics set aside $100,000 in case of a financial emergency. Today, that account has increased in value to $230,323. What rate of interest is the firm earning on this money?