Answer:
Answer A: $523.97
Explanation:
Here the principal, P, would be $400; the annual interest rate would be 9%, or 0.09 as a decimal fraction; the elapsed time would be 3 years; and the compound amount is to be calculated using the formula A(t)=P*e^rt.
Then A = $400e^(0.09)^3, or
A = $400)(1.309) = $523.986, or $523.99 The initial $400 principal would have grown to $523.97 (Answer A is closest).