You have $700 to invest. If you can cam 8% interest, about how long does it take for your $700 investment to grow to $1,400? Suppose the interest rate is just half that, at 4%. At half the interest rate, does it take exactly twice as long to double your money? Why or why not? How long does it take? If the annual interest rate is 8%, the number of years it takes to double your money is years. (Round to two decimal places.)