Challenge  You have 2 different savings accounts. For Account​ A, the simple interest earned after 18 months is ​$4.80. For Account​ B, the simple interest earned after 21 months is ​$23.10. If the interest rate is 3.2​% for Account A and 2.2​% for Account​ B, how much is the principal in each​ account? Which account earned you the most interest the first​ month? Explain your answer.