Which of the following examples have a constant rate of change? 1. The amount bacteria double every hour.

2. A salesperson earns $50 plus $10 for every $100 of merchandise he sells.
The money you put in the bank earns 5% interest. This means that the bank pays you

3. 5% of the amount of the money kept in the bank each year.

4. You drive from Colorado to Texas. In the first 4 hours, you cover 240 miles, and in the second 5 hours, you cover another 240 miles.