4. 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 increase in prepaid expenses, and $13,020 increase in wages payable. What is the net cash flows provided (used) by operating activities using the indirect method? A. ($539,200) B. $300,800 C. $561,200 D. ($300,800) E. $539,200