Hello, thank you for taking the time to post your question!
In order to solve for the end value on this one you want to use the compound interest formula
A = P(1 + r/n)^(nt)
Plugging in the values given in the information in the question makes this
A = 6100(1 + 0.031/12)^(12*77)
n = 12 since it’s saying monthly compounding over the 77 years
when I plug everything in then I get $66,168.92 for the value … so the value of the investment after 77 years is $66,168.92 for this scenario
I hope that helps get you moving in the right direction! Feel free to reach out if you have any additional questions beyond that :)
