Please can someone help me set up this so I can work it out .Not sure the steps.

Clay brought a $500 series EE bond and redeemed it after 4 years for $329.20. How much interest did Clay earn?

2 answers

the bonds are bought for half of face value ... $250 in this case

bought for $250 ... sold for $329.20 ... how much interest?
79.20 answer THANK YOU FOR THE HELP