Repeating decimal - sum of A + B

Hi, I solved this by doing the following. Could you please explain why it is wrong?

Let x = 3.24 (recurring)

multiply both sides by 100 and subtract x

99x = 324
x = 324/99 which is simplified to 36/11. Answer is 47.

100x - x = 99x = 324.\overline{24} - 3.\overline{24} = 321

Thank you so much, that was so very silly. My bad.