Gary spent 5/8 of his money on 6 identical notebooks and 8 identical files. Each file cost thrice as much as each notebook. Then, he spent 4/9 of his remaining money on a magazine. The magazine cost $16.80 more than each notebook.
(a) What fraction of Gary’s money was spent on the magazine? Give your answer in the simplest form.
(b) How much money had Gary left?