Solve the following problems. **Rule of 72**, **Simple Interest, & Future** **Value **

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__Rule of 72__

1. How many years does it take an investment ** to double** earning 5%?

**Rule of 72**

2. How many years does it take an investment ** to double** earning 8%?

**Rule of 72**

3. How many years does it take an investment ** to double** earning 7.50%?

**Rule of 72**

4. How many years does it take an investment ** to double** earning 9%?

**Rule of 72**

5. How many years does it take an investment ** to double** earning 4%?

**Rule of 72**