Computing annuity payment. Kevin Winthrop is saving for an Austrailian vacation in three years. He estimates that he will need $ 5,000 to cover his airfaire and all other expenses for a week-long holiday in Austrailia. If he cn invest his money in an S & P 500 equity index fund that is expected to earn an average return of 10.3 percent over the next three years, how much will he have to save every year if he starts saving the end of this year?