Sarah Wiggum would like to make a single investment and have $2.9 million at the time of her retirement in 25 years. She has found a mutual fund that will earn 3 percent annually. How much will Sarah have to invest today? If Sarah invests that amount and could earn a 15 percent annual return, how soon could she retire, assuming she is still going to retire when she has $2.9million? To have $2.9 million at retirement, the amount Sarah must invest today is $______? .