Question 35041
Hello,
Seems you are right in your step-by-step methodology. Just one small problem.

here is the formula for the total amount at the end of the period, interest compounded

{{{ Amount = Principal(1+r/n)^(nt) }}}
so,
{{{ Amount = 500(1+.1/4)^(4*20) }}}

solve, and you get Amount = $3,604.78 :-))

Looks like the last (nt) term you had was multiplied, not raised to the power. That was the problem