Answer: The answer is $129,000.
Explanation: The $129,000 amount above was derived by adding the movement in account receivable to the income reported on the income statement for the year. Since there are no effects of other adjustments, cash flows from operating activities would be, income $120,000 plus movement in account receivable ($31,000 - 40,000) = $9,000, giving rise to $129,000. Since account receivable decreased, it means there was an inflow of cash.