(Future value) Sarah Wiggum would like to make a single lump-sum investment and have $2.4 million at the time of her retirement in 32 years. She has found a mutual fund that expects to eam 7 percent annually. How much must Sarah invest today? If Sarah earned an annual return of 16 percent, how much must she invest today? a. If Sarah can earn 7 percent annually for the next 32 years, how much will she have to invest today? $ (Round to the riearest cent.) b. If Sarah can earn 16 percent annually for the next 32 years, how much will she have to invest today? $ (Round to the nearest cent.)