Refer to the following items on the balance sheets of a firm for the years ending December 31, 2018 and 2019. If the firm's interest expense on its 2019 income statement was $408,516, calculate the net cash flow to the firm's creditors in 2019. \begin{tabular}{l} $606,609 \\ $210,423 \\ \hline$522,416 \\ \hline$408,516 \end{tabular}