During the accounting period, Mark's Company earned $100,000 in revenue on account and collected cash revenues of $50,000. During this period, Mark's Company accrued $30,000 in expenses and paid out cash expenses of $10,000. What would be the net cash inflows from operating activities on the cash flow statement for this period.

1) $40,000

2) $50,000

3) $170,000

4) $120,000