Ok if you invest 720$ and put it in an account that has an annual intrest rate of 6.2% and you wanna know how much money will be there in 5 years thats an easy question because basically you get 720$ and add 6.2% to it which gives you 720.062$ so now you multiply by 4 years because the intrest rate comes annually which means yearly so that shall give you your answer of 2880.248 which should be your answer if that helps any I hope that helps