Final answer:
Mable Corporation's net inflow or outflow for year 1 is $30,000.
Step-by-step explanation:
Mable Corporation's net inflow or outflow for year 1 can be calculated by subtracting the increase in liabilities from the increase in assets. In this case, the increase in assets is $50,000 and the increase in liabilities is $20,000. Therefore, the net inflow or outflow for year 1 is $50,000 - $20,000 = $30,000.