George and Laura will be retiring in ten years and would like to buy a lake house. They estimate that they will need $550,000 at the end of ten years to buy this house. They want to make ten equal annual payments into an account at the end of each year. If they can earn 8% on their money, compounded annually, over the next ten years, how much must they invest at the end of each year for the next ten years to have accumulated $$50,000 by retirement