Your aunt has $780,000 invested at 5.5%, and she now wants to
retire. She wants to withdraw $45,000 at the beginning of each
year, beginning immediately. She also wants to have $50,000 left to
give you when she ceases to withdraw funds from the account. For
how many years can she make the $45,000 withdrawals and still have
$50,000 left in the end?