**Let's try something messier:**

**If we invest $400 a month at 8.4%, how much will we have in 40 years?**

**investment amount = $400**

**growth factor = $1.007**

**interest per period = .007**

**number of periods = 480 **

**TRY IT:**

**Invest $250 a month at 9%. How much will you have in 20 years?**

**One more... and this one we'll do yearly instead of monthly. (So, we'll have to assume it's compounded yearly.)**

**If we invest $5000 a year at 10%, how much will we have in 25 years?**

**investment amount = $5000**

**growth factor = $1.10**

**interest per period = .10**

**number of periods = 25 **

**YOUR TURN:**

**Invest $10,000 a year at 15%. How much will you have in 35 years?**