5. Assume the total cost of a college education will be $195,000 when your cousin enters college in 10 years. Your family presently has $45,000 to invest. What annual rate of interest must be earned to cover the cost of your cousin's college education? 6. At 10% annual interest, how long does it take to triple your money? 7. In 2006, a 50-cent piece issued in 1904 sold for $1,300. What was the rate of return on this investment