Muriel would like to support the education of her favourite grand-nephew, Stephen, who plans to begin university in 3 years. How much will Muriel have to invest today, at 4 percent, to be able to give Stephen $8,140 at the end of each year for 4 years? (Round answer to 2 decimal places, e.g. 125.12. Do not round your intermediate calculations.)

Amount to be invested today

$

P.S. I found the answer to be 29547.35, but it's wrong.