Walker Company reports net income of $420, 000 for the year ended December 31, 2010. It also reports $75,600 depreciation expense and a gain of $11,000 on the sale of machinery. Its comparative balance sheets reveal a $33,600 decrease in accounts receivable, $17,220 increase in accounts payable $9,240 decrease in prepaid expenses, and $13,020 increase in wages payable. What is the net cash flow provided (used) by operating activities using the indirect method? ($539,200) $300,800 $561, 200 ($300,800) L $539,200