The simple interest equation is -
(total amount) = (starting amount) * (rate)^(time)
Let's plug in your numbers.
t = 412 * 1.034^9
(The reason I used 1.034 is because you keep the original value (1) and add 3.4% more each year (.034).)
Now you solve!
t = 412 * 1.35109177
t = 556.649809
t ≈ 556.65
So your answer is $556.65
:)
