And employee plus $5000 in retirement account that offers 9% interest compounded annually the employee makes no additional deposits or withdrawals which amount is closest to the interest-rate employee would have earned at the end of five years

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?