1. In 2005 selected automobiles had an average cost of $16,000. The average cost of those same automobiles is now $20,000. What was the rate of increase for these automobiles between the two time periods?
2. If you desire to have $10,000 for a down payment for a house in five years, what amount would you need to deposit today? Assume that your money will earn 4 percent.
3. Carla Lopez deposits $2,500 a year into her retirement account. If these funds have an average earning of 8 percent over the 40 years until her retirement, what will be the value of her retirement account?